The evolution of bilateral symmetry was a necessary precursor for the evolution of _______.

a. tissues
b. segmentation
c. a body cavity
d. cephalization


Answer: d. cephalization

Biology & Microbiology

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The ________ serves as structural support, in tissue organization, and as a permeability barrier.

Fill in the blank(s) with the appropriate word(s).

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What is the inorganic soil constituent with the finest particles?

a. clay b. gravel c. humus d. sand e. silt

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Which of the following are actual mutualistic partnerships that involve a protist and a host organism?

a. cellulose-digesting gut protists: wood eating termites b. dinoflagellates: reef building coral animals c. trichomonas: humans d. algae: certain foraminferans e. all except that involving humans

Biology & Microbiology

Upon being formed, oceanic islands, such as the Hawaiian Islands, should feature what characteristic, leading to which phenomenon?

A) mass extinctions, leading to bottleneck effect B) major evolutionary innovations, leading to rafting to nearby continents C) a variety of empty ecological niches, leading to adaptive radiation D) adaptive radiation, leading to founder effect

Biology & Microbiology