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frozen [14]
3 years ago
15

Tectonic plates are pieces of the ________ that float on the more semi-solid ________ below.

Biology
1 answer:
Nastasia [14]3 years ago
6 0
Fill in the first blank with lithosphere and the second blank with asthenosphere to make the sentence true.
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In the triglyceride molecule shown below, what molecule are the fatty acids attached to?
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Glycerol!

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Explain why a message moving along nerve pathways takes time.
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The conduction of nerve impulses relies upon the movement of positively-charged ions across the nerve cell membrane. The entry of sodium into the cell produces a wave of positive charge that travels down the length of an axon. Then chemicals called neurotransmitters are secreted out of the end of the axon onto the next nerve in the series (the postsynpatic nerve). This narrow space in between neurons is called the synapse. These neurotransmiiters released by the presynaptic nerve bind to receptors on the postsynaptic nerve. The binding of these receptors opens up channels in this second nerve's membrane that allow sodium ions to enter the nerve cell and initiate another wave of positive charge, and so on... The nerve signal can only move as fast as these ions and neurotransmitters can diffuse to generate this process. 

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<span>Additionally, there are sheaths of fatty tissue (called myelin) that insulate the charge in the neuron and allow it to be conducted faster. As people age, these sheaths can start to degrade, making the nerve cell more "leaky" and causing the impulse to be conducted more slowly. </span>
8 0
4 years ago
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In one fishing village in Alaska, the allele frequency of webbed feet is 0.10. This dominant trait causes affected individuals t
larisa86 [58]

Answer:

Phenotypic frequency of the dominant trait = 0.19 ⇒ the frequency of individuals in this village that have webbed feet

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf
4 0
3 years ago
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