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(1) A message travels from the nervous system to the muscular system, triggering chemical reactions.

(2) The chemical reactions lead to the muscle fibers reorganizing themselves in a way that shortens the muscle--that’s the contraction.

(3) When the nervous system signal is no longer present, the chemical process reverses, and the muscle fibers rearrange again and the muscle relaxes.

Answer:

it is very important Max eats. with that busy schedule, he needs nutrition.

he should clean up around the house at the end of the day, leaving him time at noon for lunch. he should also eat during/before his video games.

Max should have at least 2,800 calories a day.

Explanation:

He needs to eat more food, and the food he does consume needs to be healthier. In the time he has to do things like video games, he should eat a healthy meal as well. He seems very active and so he needs proteins

The balanced chemical equations are as follows:

Each atom on both sides of a balanced chemical equation has the same number and type. A balanced equation's coefficients must have the simplest whole number ratio. In chemical reactions, mass is always conserved.

The most important aspect of balancing chemical equations is to satisfy the law of conservation of mass, which states that "total mass of products equals total mass of all reactants."

A chemical equation that is not balanced violates the law of conservation of mass. It will indicate that mass is either created or destroyed, both of which are impossible.

Different types of reactions are Combustion reaction, Decomposition reaction, Neutralization reaction, Redox Reaction, Precipitation or Double-Displacement Reaction, and Synthesis reaction based on the product formed.

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A direct ecosystem service resource is fresh water. Ecosystem services are advantages that humans derive from ecosystems.

Forests and grasslands provide a range of ecosystem services. In addition to providing food, fuel, and fibre, forests preserve biodiversity and genetic resources, purify the air, filter water supplies, control flooding and erosion, and provide opportunities for recreation, education, and cultural enrichment.

Direct ecosystem services are those offered by an ecosystem that directly benefit people. They consist of food, water, the cycling of nutrients, crop pollination, precipitation, and other material advantages.

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Answer: if a farmer or rancher wants to change the nutrients in his or her soil

Explanation:

The nutrients in the manure plays an important role in growth and development of the crops and they improve the fertility of the soil. Certain mineral elements present in the manure can change the pH of the soil which can affect the growth of the plants. Thus the mineral content of the manure should be tested thoroughly before changing the nutrients in the soil by providing the manure to the soil.

Answer:

If the farmer wants to change the nutrients in his or her soil.

Explanation:

Took the test.

Answer:

Answer:

Photosynthesis!!!!!!!!

Explanation:

I just had this question on my A.P.E.X test

The statement that best describes the role of amylase in this reaction is to lowers the activation energy needed for the reaction to occur (option A).

Enzymes are biological substances and globular proteins that catalyse a biological chemical reaction.

Enzymes enact their operation by reducing the activation energy, which is the energy required for the reaction to start.

According to this question, starch, a polysaccharide, is broken down into individual units of maltose in the presence of an enzyme known as amylase. The amylase as an enzyme acts to lower the activation energy.

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Answer:

which language is this ??????

Genes that are located on the same chromosomes are linked genes. Alleles for these genes tend to segregate together during meiosis unless they are separated by crossing-over. The closer together two genes are on a chromosome, the less likely their alleles will be separated by crossing-over. A pair of genes with a larger recombination frequency are likely farther apart, while a pair with a smaller recombination frequency are likely closer together.

The figure shows two alleles that are closest together - tail-feather length aand feather color which is only 4 units in distance.

Answer:

Plateaus

Explanation:

A plateau is a flat, elevated landform that rises sharply above the surrounding area on at least one side. Plateaus occur on every continent and take up a third of the Earths land. They are one of the four major landforms, along with mountains, plains, and hills.

Answer:

Abiotic simply means a non-living thing.

Therefore, my understanding of the characteristics of life are those things that show that something is living.

Things like:

Movement

Respiration

Nutrition

Irritability

Growth

Excretion

Reproduction

Death.

Answer:

Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey

Explanation:

predation is the process itself where the predator for example the lion feeds on the prey like deer

Answer:

look in the image below

Explanation:

The third trophic level is made up of prairie dogs that get their matter and energy from the grasses (option d).

The energy pyramid depicted in the image illustrates the flow of energy through an ecosystem. In an energy pyramid, each level represents a trophic level, indicating the position of organisms in a food chain. The pyramid narrows as it ascends, indicating the decrease in available energy at higher trophic levels.

In this specific pyramid, the lowest trophic level is occupied by the grass. This makes sense because grass is a producer that captures energy from the sun through photosynthesis. As a result, it possesses the most energy within the ecosystem.

Moving up the pyramid, the second trophic level is occupied by the prairie dogs. They are herbivores that primarily consume grass for their energy needs. This demonstrates that the prairie dogs acquire their matter and energy from the grasses, supporting option D.

The third trophic level contains the coyotes, which are tertiary consumers. Tertiary consumers feed on other consumers, not producers. Therefore, option A is incorrect since vultures, not coyotes, are tertiary consumers in this ecosystem.

Option B is also incorrect because the coyotes do not obtain their energy from other coyotes located in the third trophic level. They acquire their energy indirectly from the grasses through the prairie dogs.

Finally, option C is incorrect as it states that the grasses' trophic level has the most energy. While the grasses are indeed the primary producers and possess the most energy, not all of that energy moves to the second trophic level.

Thus, the correct statement supported by the ecological pyramid is option D: The third trophic level is made up of prairie dogs that get their matter and energy from the grasses.

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"The derived shared characteristic 'Terrestrial during all stages' should be placed at the base of the tree diagram."

SupThe characteristic "Terrestrial during all stages" is a shared characteristic among all five species being compared in the branching tree diagram. This means that it is a characteristic that all of these species have in common, and therefore it is likely that it was present in their common ancestor.

Since the base of the tree represents the common ancestor of the species being compared, it makes sense to place this characteristic at the base of the tree. This also helps to show that this characteristic is a defining trait of the group of species being compared and that it has been present in their lineage since their common ancestor.

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Answer:

QUESTION:

where do I place Echinodermata on the phylogenetic tree​?

ANSWER:

Echinoderms include starfish, sea urchins, sand dollars, and feather stars. Echinoderms are found in many different ocean environments, but most are found in reefs.

Explanation:

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Answer:

The gram reaction is an important tool for identifying bacterial species based on their cell wall composition. The gram-positive bacteria have thick peptidoglycan cell walls that stain purple with the crystal violet stain, while the gram-negative bacteria have thinner peptidoglycan cell walls and an outer membrane that stains pink with the counterstain safranin.

For the physician, the gram reaction can help guide antibiotic therapy since gram-positive and gram-negative bacteria are often susceptible to different classes of antibiotics. Knowing the gram reaction of a bacterial species can also help the physician determine the likely pathogenicity of the bacteria and the severity of the infection.

For the laboratory technician, the gram reaction is an important initial step in bacterial identification. It can help narrow down the possible bacterial species and guide further testing. Additionally, the gram reaction can provide important information about the bacterial cell wall, which can be useful in understanding the bacterial physiology and in developing new antibiotics.

Hope this helps!

Answer:

The answer is measures humidity, temperature, and dew point simultaneously

Explanation:

It measures the humidity in an certain area of choice.

Answer: Answer is below <3

Explanation: Selective herbicides are able to selectively target broad-leaf weeds or grass weeds, depending on the chemical, without harming your lawn, while non-selective herbicides, like glyphosate (Freezone Tuffweed) will kill any plant they come into contact with.

Answer:

C

Explanation:

I would say C because it HAS to have valid data. Which is a limitation especially if you can't get that data.

A testable hypothesis is one that can be tested through empirical research, meaning that it is possible to gather evidence to support or refute it.

A hypothesis is a possible explanation that is proposed for a phenomenon that occurs in nature. In the scientific method, hypotheses are tested by collecting and analyzing data to either support or reject them.

A testable hypothesis could be formed from a question by using the following steps:

Identify the phenomenon that you want to study: Start by identifying the phenomenon that you want to study. This could be a relationship between two variables or a question about how something works. Develop a research question: Based on the phenomenon you want to study, develop a research question that can be answered through empirical research. This question should be specific and should be able to be tested using scientific methods. Formulate a hypothesis: Using your research question, formulate a hypothesis that can be tested through empirical research. This hypothesis should be a statement that proposes a possible explanation for the phenomenon you are studying. It should be clear, concise, and testable.

Test the hypothesis: Once you have developed a testable hypothesis, you can design and conduct experiments to gather data that will either support or refute the hypothesis. If the hypothesis is supported by the data, you can consider it to be a valid explanation for the phenomenon you are studying. If the data refute the hypothesis, you may need to revise it or develop a new hypothesis.

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Explanation:

RNA growth is always in the 5′ → 3′ direction: in other words, nucleotides are always added at a 3′ growing tip, . Because of the ANTIPARALLEL nature of the nucleotide pairing, the fact that RNA is synthesized 5′ → 3′ means that the template strand must be oriented 3′ → 5′.

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In biology, autotrophs are organisms that can produce their own food using inorganic substances, such as sunlight and carbon dioxide.

Autotrophs  are also known as primary producers because they form the base of the food chain by converting energy from the environment into organic compounds.

The topic of autotrophs is typically covered in the study of plant biology in the context of a class 7 curriculum.

The most prevalent kind of autotrophs are plants. They do this through a process known as photosynthesis, which turns carbon dioxide, water, and sunlight into glucose (a sugar) and oxygen.

Chloroplasts, specialized organelles found in plant cells, are where this process occurs.

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Answer:

The initial size of the population of rabbits is 40 rabbits.

Explanation:

By finding the complete question online and using the simulation provided with it, It is evident that there are 40 rabbits at the start of the simulation.

Answer:

In a muscle contraction,neurotransmitter acetycholine stimulate the post synaptic membrane of the neuron or the sarcolemma  of the muscles cells at the motor end plate .This neurotransmission effect  leads to the opening of ligand gated sodium channels.

Therefore action potential(Endplate potential) is transmitted across the synaptic juction to to the muscles to  bring  about contraction of muscles(effector) .Therefore Acetycholine is refereed to as excitatory hormone.

Curare works as competitive inhibitor of acetycholine at the motor end plate. It prevents the binding of Acetycholine with the endplate.Therefore, ligand gated Na+channels can not open, thus End potential can not be  generated due to lack of depolarization, thus contraction of muscles is inhibited.

Thus,despite the fact that the neurotransmitter is produced, the curare has blocked the end plate.So, no muscles contraction will occur because ,no place for the the excitatory acetylcholine to bind with.Hence the the muscle cells are in the permanent state of  relaxation (resting membrane potential).

Animals poisoned with this substance usually asphyxiate because of paralysis of the diaphragm, external and internal inter-coastal muscles and  collapse of the lungs and therefore failure of the entire respiration  muscles and system.Thus lack of oxygen from failed breathing.

Explanation:s

In a

Answer:

Superior mesenteric artery.

The primary source of energy for the body is a form of sugar called glucose. It travels to cells all throughout the body after being absorbed into circulation from the small intestine.

Other chemicals that enter the circulation through the small intestine include the following:

Proteins' building components are amino acids.

The lipids' building components are fatty acids.

minerals and vitamins

Water

In an adult, the small intestine is a muscular tube that is roughly 20 feet long. It is situated in the belly, above the large intestine, and below the stomach. The bulk of digestion and nutritional absorption from meals occurs in the small intestine.

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The example that includes only chemical changes that occur in the digestive process is the reaction of saliva, stomach acid, bile, and pancreatic juices with food. Option D.

Chemical changes refer to changes to the chemical properties of substances. In biological reactions, these substances are referred to as reactants.

Chemical changes are different from physical changes. In physical changes, only the physical properties of substances are altered while their chemical properties remain intact.

When a substance changes chemically, its physical properties most often change along. However, this is not in all cases.

Thus, looking at the examples given, their classification into either physical or chemical changes is as follows:

When saliva, stomach acid, bile, and pancreatic juices react with food, the chemical properties of food change because the enzymes convert different components of food from one form to another as part of the process of digestion.

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Mendel had to prohibit self-pollination since he was only interested in the progeny of two distinct parent plants. The blooms of some of the plants used in his tests had their anthers removed.

After that, he manually pollinated them using pollen from other parent plants of his choosing. He removed a flower's male components, which contain the pollen, and then pollinated the remaining female parts with pollen from another plant.

In order to stop flowers from self-pollinating, they are "emasculated," or have their anthers removed.

Cross-pollination occurs when pollen from one species of plant reproduces another species of plant. A hybrid is the term used to describe the offspring produced by such a cross.

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