Which phylum contains organisms divided into a head, thorax and abdomen?

A. Mollusca
B. Arthropoda
C. Nematoda
D. Annelida
E. Porifera


Answer: B

Biology & Microbiology

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Based on fossil evidence, ____ is the oldest of the species listed

a. Homo habilis b. Homo erectus c. Australopithecus africanus

d. Australopithecus afarensis e. Homo neanderthalensis

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__________ are free-living and usually kill their prey. Fill in the blank(s) with the appropriate word(s)

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Among social animals, cooperative behavior does NOT usually include

A) alliances among members of the population. B) everybody doing their own thing. C) division of labor. D) increased likelihood of finding mates. E) a caste system in which individuals do certain jobs.

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How long are restriction endonuclease recognition sequences?

A) 4-12 nucleotides B) 5 to 3 nucleotides C) Length can vary by 100 nucleotides, depends on organism

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