It is estimated that as much as ________ of the cycling nitrogen in the oceans is contributed by anammox bacteria.
A. 70%
B. 40%
C. 10%
D. 25%
Answer: A
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Postnatal growth is most rapid in a human child
a. during the first two weeks. b. from two weeks to fifteen months. c. from infancy to ten years. d. from ages thirteen to nineteen. e. during adulthood.
The most abundant waste product of metabolism is
a. carbon dioxide. b. ammonia. c. urea. d. uric acid. e. water.
You find some rather strange plants in your backyard. They consist only of thin, pale yellow stems that are wrapped around other species of plants growing nearby. You experiment by unwrapping some of the strange yellow plants and planting half of them alone in pots of soil and half in pots with other plants from your yard. You water and fertilize both sets of pots, but after a few weeks you find that the yellow plants that were potted alone have died, while those potted with other plants are thriving. What term would you use to describe the strange yellow plants?
A. holoparasitic B. asexual C. monophagous D. aposematic E. hemiparasitic
Which of the following stages of embryonic development consists of only two layers of cells?
A. early gastrula B. morula C. late gastrula D. blastula