Multiple Choice
The "Cambrian explosion" refers to
A) the mass extinction of dinosaurs.
B) the origination of all major phyla of animals.
C) the development of the first true cell.
D) the origination of life.
E) the creation of Earth.
Correct Answer:

Verified
Correct Answer:
Verified
Q23: Snails and squids belong to the phylum<br>A)CnidariA.<br>B)Porifera.<br>C)Platyhelminthes.<br>D)Mollusca.<br>E)Annelida.
Q24: If you were looking at a model
Q26: A circulatory system in which the heart
Q29: Which is not a reptile?<br>A)bat<br>B)snake<br>C)crocodile<br>D)turtle<br>E)penguin
Q30: Which is not an animal?<br>A)penguin<br>B)mushroom<br>C)shrimp<br>D)sponge<br>E)spider
Q31: Pinworms and hookworms belong to the phylum<br>A)NematodA.<br>B)Annelida.<br>C)Platyhelminthes.<br>D)Porifera.<br>E)Cnidaria.
Q65: Segmentation is easy to observe in the
Q68: Though animals are very diverse,some features are
Q75: Nematodes are protected from environmental hazards in
Q80: Which of the following is a trait