Here are a couple of features of a flat worm:
. They have soft bodies
. Its scientific name is Platyhelminthes
. There about 20,000 spices of a flat worm
. Flat forms can cause death
. They have ribbon like bodies
. They have know circulatory organs
. They have no respitory organs
.have membranes that enables them to absorb nutriments and oxygen by diffusion
It's easy to say "ooo fossils" but as far as what kind goes I would say cave drawing and marking have proven to show their was life back then. (I have no clue if this helps)
Answer: Refractory Period
Explanation:
Refractory Period is a period of time during which an organ or cell is not able to repeat a particular action, or the amount of time it takes for an organ or cell to be ready for a second stimulus.
