Blood from the ____________________ returns to the heart through the pulmonary veins. Fill in the blank(s) with the appropriate word(s)
ANSWER: lungs
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The overall ecological efficiency of most organisms is between ____ percent
a. 1 and 2 b. 2 and 5 c. 5 and 20 d. 10 and 50 e. 50 and 75
Suppose that you have a population of guinea pigs in
which two-thirds of the alleles for coat color specify black, and one-third specify white. According to the Hardy-Weinberg rule, what will be the ratio of these alleles in the gene pool in future generations, provided all the guinea pigs reproduce? a. 1:1 b. 2:1 c. 3:1 d. 6:1 e. 7:1
A newly evolved species may take over an ecological role or ecological niche that is already occupied
if the new species has:a. the ability to alter or change the environmental parameters. b. features that make it competitively superior to the original occupant of that niche. c. the ability to evolve through natural selection, whereas the original occupant cannot continue to evolve. d. the ability to grow to a larger size, thus providing it with a selective advantage. e. fitness that is almost as high as the fitness of the original species.
In flowering plants, what is the relationship between the sporophyte and gametophyte?
A) The gametophyte is dominant, and the sporophyte is microscopic. B) The sporophyte and gametophyte are independent of each other. C) Flowering plants do not produce gametophytes. D) Flowering plants do not produce sporophytes. E) The sporophyte is dominant, and the gametophyte is retained on the sporophyte.