Answer:
A genetic factor for a trait that is always expressed when it is present is best described as dominant.
<u>OAmalOHopeO</u>
I believe the answer is A
.Most life-forms that existed on Earth have become extinct.
<span>.Dinosaurs existed on Earth for more than 544 million years.
Both these statements are well suported by fossil record.</span>
I kinda remember it and I think it's 60%
I'm not sure if this question is talking about neurons, but if it is... depolarization in a neuron leads to an "action potential."