Author Question: Platyhelminthes were the first organisms to have: A) fully developed brain. B) notochord. C) ... (Read 20 times)

mydiamond · **on:** Aug 22, 2018

Platyhelminthes were the first organisms to have:
A) fully developed brain.
B) notochord.
C) central nervous system.
D) All of these choices.

Question 2

Which statement is true with regard to internal waves?
A) Internal waves usually move very fast.
B) Internal waves form at the boundary between water layers of different densities.
C) Internal waves are only generated by wind energy.
D) Internal waves form at the junction between air and water.