The normal pH of rainfall is
A. slightly acidic, pH 5.6.
B. slightly basic, pH 5.6.
C. slightly acidic, pH 9.6.
D. slightly basic, pH 9.6.
E. neutral, pH 7.0.
A. slightly acidic, pH 5.6.
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Where are the largest reserves of carbon on the planet?
A. soils B. frozen lakes C. rocks and fossil fuels D. fossil fuels E. the oceans
Once a pollen tube lands on a compatible stigma
a. chemical cues guide the pollen tube from the stigma to the embryo sac of an ovule. b. that pollen tube continues on to another ovule. c. other pollen tubes are attracted to that ovule. d. other pollen tubes can penetrate that ovule more easily. e. the flower dies to prevent further pollination
Why might predators take more time to recover following a disturbance than herbivores or producers?
a. Recovery time is based on the flow of energy, so herbivores recover first, then producers, and then predators b. Recovery time is based on the flow of energy, so producers recover first, then herbivores and finally predators. c. Recovery time is based on solar cycles, and thus predators are the second group to recover. d. Predators actually recover more quickly than others because of their mobility.
In the development of C. elegans, an embryo of 1090 cells then loses 131 cells. This is an example of what process?
What will be an ideal response?