Platyhelminthes were the first organisms to have: A) fully ...

[mydiamond]

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.

[kaykay69]

Answer to Question 1

C

Answer to Question 2

B

[mydiamond]

Gracias!

[bigcheese9]

Excellent