__________ can be used to estimate the population density for mobile animals. Fill in the blank(s) with the appropriate word(s)
Mark-recapture methods
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Which one of the following is not one of the major elements that make up 96 percent of all
living organisms?
a. carbon b. oxygen c. helium d. nitrogen
A phospholipid is similar to a fat but has
A. a glow when placed in a dark room. B. no oxygen. C. a phosphate group. D. no carbon in it.
When closely related individuals mate with each other, or inbreed, the offspring are often not as fit as the offspring of two unrelated individuals. Why?
a. Close relatives are genetically incompatible. b. The DNA of close relatives reacts negatively in the offspring. c. Inbreeding can bring together rare, deleterious mutations that lead to harmful phenotypes. d. Inbreeding causes normally silent alleles to be expressed.
Which of the following is TRUE of cell cleavage?
A. It involves consecutive cycles of cell division without cell growth. B. It forms a blastula. C. It is a rather slow event of embryonic development. D. It involves consecutive cycles of cell division without cell growth and forms a blastula. E. It is a rather slow event of embryonic development involving consecutive cycles of cell division.