One proposed mechanism for the evolution of multicellularity involves an ancestral multinucleate cell in which plasma membranes formed between nuclei,resulting in a multicellular organism.This proposed mechanism is referred to as the __________ hypothesis.
A) colonial
B) coenocytial
C) polyphyletic
D) metazoan
E) synthetic
Correct Answer:
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Q11: Excretion and gas exchange in sponges are
Q12: The _ is the simplest,but least common
Q13: Eggs and sperm of sponges are commonly
Q14: The single large opening at the top
Q15: Gemmules contain masses of _ which can
Q17: Contractile pinacocytes that can regulate water circulation
Q18: The collar of a choanocyte
A)regulates the diameter
Q19: The unique adhesive cells of ctenophores are
A)statoblasts.
B)cnidoblasts.
C)colloblasts.
D)pleuroblasts.
E)statoliths.
Q20: Freshwater (and some marine)sponges form resistant structures
Q21: Members of this cnidarian class include the
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