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Nautilus adjusts its vertical position in the water column by means of


A) Gas secretion
B) Use of low-density ions
C) Swimming upward continuously
D) Delicate projections from the shell that prevent sinking

E) A) and B)
F) C) and D)

Correct Answer

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During a cycle of cell division, diatom


A) Body size increases
B) Body size decreases
C) Needs for silica steadily increases
D) Reproduction does not occur

E) None of the above
F) A) and D)

Correct Answer

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