Which statement about the phosphorus cycle is true?
a. The natural weathering of rocks sends phosphate into lakes and oceans.
b. Phosphate from geothermal vents causes dead zones in lakes.
c. Phosphate enters the oceans primarily through precipitation.
d. The average phosphate ion resides in the ocean for less than 500 years.
a. The natural weathering of rocks sends phosphate into lakes and oceans.
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Which of the following kinds of traits was originally used for classifying organisms into taxonomic
categories?
a. morphology and behavior b. DNA and amino acid sequences c. physiology and biochemical pathways d. geography and ecology e. morphology and physiology
Olfaction is another name for the sense of
A. body position. B. smell. C. hearing. D. pain. E. equilibrium.
Which pigment(s) is/are characteristic of chlorophytes?
a. chlorophyll a b. phycobilins c. chlorophyll b d. fucoxanthin e. chlorophylls a and b
At what phase in the cell cycle does DNA replication occur?
A) G0 B) S C) G1 D) M