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Vladimir [108]
3 years ago
5

How do biologists model changes in a population?

Biology
1 answer:
dimaraw [331]3 years ago
3 0

Explanation:

It changes to improve more because humans are so popular in the world.

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Laws differ from theories because laws do not provide
Alborosie
Laws can be tested over and over and their results will still be the same, and laws cannot be disproved. Theories can always be disproved beause they are tested and experimented continously and results can change. Laws can't be theories but theories can be turned to laws. Hope this helps, didn't know an exact answer to that but I hope you can draw your answer from this information.
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3 years ago
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Place these events in the correct order of occurrence in the muscle contraction: End plate potential triggers an action potentia
Sunny_sXe [5.5K]

Answer:

1. Acetylcholine binds to receptors on the motor end plate

2. Ligand-gated channels open leading to depolarization

3. End plate potential triggers an action potential  

4. Transverse tubules convey action potentials into the interior of the muscle fiber

5. Calcium is released from the sarcoplasmic reticulum

6. Calcium ions bind to troponin, which then moves tropomyosin

Explanation:

Acetylcholine (ACh) is a signaling molecule (neurotransmitter) that binds to receptors on muscle cells. This binding triggers the opening of ligand-gated sodium channels, thereby ions enter into muscle cells, which causes the depolarization of the sarcolemma and thus promotes the release of Ca2+ ions from the sarcoplasmic reticulum. The myoneural junction, also known as the motor endplate, is the site of synaptic contact between a motor axon and a skeletal muscle fiber. The endplate potential is the voltage that produces the depolarization of muscle fibers when ACh molecules bind to their receptors in the cell membrane. This depolarization spreads in the sarcolemma through transverse tubules (T tubules​) and thus generates an action potential. Finally, this action potential induces the release of Ca2+ in the sarcoplasmic reticulum, which activates troponin protein and induces muscle contraction.

4 0
3 years ago
Please help me How do the biotic factors vary within an ecosystem and why?
DochEvi [55]

Answer:

Biotic factors are just everything living (bio-) in an ecosystem. So they're bound to vary in every ecosystem, based on the biome, climate, other food sources available, et cetera.

Do you see flamingoes in the forest? No, you say? Well, they're living; they're biotic factors. They aren't in a forest or a jungle ecosystem because that's not their habitat and they don't thrive there.

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What organic compound makes up the major portion of the cell membrane?
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A lipid does, it forms a phospholipid bilayer.
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3 years ago
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