If you were looking at a model of a sphere of animal cells with a hollow,fluid-filled center,you would cell it a
A) gastrovascular cavity.
B) blastula.
C) coelom.
D) gastrula.
E) hydrostatic skeleton.
Correct Answer:
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Q4: The embryonic germ layer of tissue in
Q8: The Mesozoic era lasted from
A) 65 million
Q15: An invertebrate is an animal that
A) does
Q15: How do scientists believe that an asteroid
Q16: The "Cambrian explosion" refers to
A)the mass extinction
Q21: Pinworms and hookworms belong to the phylum
A)NematodA.
B)Annelida.
C)Platyhelminthes.
D)Porifera.
E)Cnidaria.
Q22: Corals and jellyfish belong to the phylum
A)PoriferA.
B)Cnidaria.
C)Platyhelminthes.
D)Nematoda.
E)Annelida.
Q24: Which characteristic would place an organism outside
Q25: Cnidarians are animals found in _ environments.
A)land-dwelling
B)tree-dwelling
C)desert
D)All
Q30: Flukes and tapeworms belong to the phylum
A)
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