Answer:
D. A signal is sent down an exon within a nerve cell
Explanation:
The correct answers on Plato are
excretory system
circulatory system
<span>Messages to the brain travel along the nerves, which are strings of long thin cells called neurons</span>
Answer:
For example, if the seeds that the bird needs to eat is bigger, over time it will adapt to get a bigger beak to eat the bigger seed. The birds that have adapted reproduce and soon more and more birds that have a bigger beak for the bigger seed are more common. If the type of food available changes than the bird will most likely adapt to eat that food.
