In Frederic Clements' view, succession proceeds to an end point called a(n)
A. S1.
B. S2.
C. pioneer community.
D. climax community.
E. None of these choices are correct.
D. climax community.
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Human embryos differ from bird embryos in that
A) bird embryos undergo metamorphosis to become sexually mature adults. B) bird embryos have an extra membrane, the allantois, that is not found in human embryos. C) human embryos have a yolk sac, but it contains very little yolk. D) human embryos do not undergo cleavage. E) human embryos have no yolk sac.
Vaginitis is associated with
a. Candida. b. Lactobacillus. c. Trichomonas vaginalis. d. a and b. e. a and c.
Prions are created when normal proteins in the body ____
a. combine with large ribosomal subunit and become infectious b. exchange several long sections of amino acids with other infected proteins c. refold into a different and infectious three-dimensional shape that kills cells in the brain and nervous system d. undergo mutation and create hundreds of copies of themselves e. invade the immune system, causing it to mistakenly destroy the body's healthy tissue
Oxytocin is a hormone that is involved with increasing contractions during childbirth. The action is
binding to membrane receptors and the result is increasing sodium and calcium. Oxytocin is most likely a
a. peptide or protein. b. steroid. c. carbohydrate. d. prostaglandin. e. fatty acid derivative.