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sweet-ann [11.9K]
3 years ago
13

12)Scientists study the biosphere to examine the relationship between biotic and abiotic factors that impact the entire planet a

nd the hierarchy of life. What is defined as all of the members of a single species that live in a particular area?A)organismsB)ecosystemsC)populationsD)communities
Biology
1 answer:
andrew11 [14]3 years ago
7 0

Answer:D

Explanation:

This isn’t B, because it’s only one species. It isn’t C, because it is one population, and A doesn’t make sense due to how they are of course organisms. D is your best bet.

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Explanation:

option c

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(d) Electrical-->Chemical-->Electrical

Explanation:

A nerve impulse is the transmission of an electrical change along the neuron's membrane from the point at which it is stimulated (synapse). The normal direction of impulse in the body is from the cell body to the axon. This nerve impulse, or action potential, is a sudden and rapid change in the transmembrane potential difference.

Normally, the membrane of the neuron is polarized at rest, which means that the ionic constitution of the medium internal to the membrane is different from the external medium, which generates different electrical charges in one medium and the other, so this difference, ie , the potential during rest is negative (-70 mV). The action potential thus consists of a rapid reduction of membrane negativity to 0mV and inversion of this potential to about + 30mV, followed by a rapid return to values slightly more negative than the resting potential of -70mV.

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