Similar body parts are not always homologous. They may have evolved independently in separate lineages as

adaptations to the same ____.
a. reproductive isolation of these groups
b. environmental pressures
c. reduced genetic variability in these groups
d. identical genes in all three groups


e. genetic bottleneck


ANSWER: b

Biology & Microbiology

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

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Marine snow is composed of:

a. inorganic nutrients. b. flocculated marine salts. c. particulate organic matter. d. frozen seawater. e. terrestrial materials.

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Projections from the cell wall of the root epidermis are called

A. root hairs B. cortex cells C. root caps D. casparian strips

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How many life stages do cnidarians generally have?

a. four b. two c. three d. one e. five

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