True because of the fact that index fossils help correlate and date from its origin and date of existence. basically, it is a fossil that is kept and annalized.
<span>there is more than one path for the electrons to take.</span>
Answer:
A.
Explanation:
Because the trait undergoes a secondary loss; it has been there but it doesn't always appear in all generations.
The correct option is A.
The serosa refers to the outermost layer of loose connective tissues which is often covered by mucus and which contains blood vessels. In the gastrol intestinal tract, the serosa refers to the outermost layer of the wall of the GI tract. One major function of serosa is to reduce friction from muscle movement.
