Action potentials (i.e. nerve impulses) occur in several types of animal cells<span>, called </span>excitable cells<span>, which include </span>neurons<span>, </span>muscle cells<span>, </span>endocrine<span> cells, and in some </span>plant cells<span>. </span><span>It takes around 40 action potentials for a smell sensation to be reported.</span>
Answer:
D.
Explanation: Ecology: relation of organisms with one another or their surroundings.
<span>A. can start in many different places on a sequence at the same time. </span>
This squirrel lives in a forest and eats only acorns. <span>The squirrel will starve if it can't find enough food. </span>
