Each ____ has a characteristic number of chromosomes.
Fill in the blank(s) with the appropriate word(s).
species
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Saltwort (Batis) maintains osmotic balance with
a. succulent stems. b. salt glands. c. salt leaves. d. they cannot maintain osmotic balance; they are osmoconformers. e. salt filtration mechanisms in the roots.
As the trees in England become less sooty due to pollution controls on factories, which of the moths in the
accompanying figure will be selected against? a. The dark moth on the dark tree b. The light moth on the light tree c. All of the light moths equally d. The dark moth on the light tree e. All of the dark moths equally
The early Earth's reducing atmosphere probably contained all of the following except
A. water. B. hydrogen sulfide. C. carbon dioxide. D. oxygen. E. methane.
Due to reproductive isolation, a new species of weaver bird is evolving. Is it likely to use a social or solitary nesting strategy?
A. It depends on how many similar species it is competing with. B. It depends on whether it lives in the forest or the open savanna. C. It depends on whether it lives in near water or near the desert. D. It depends on how many eggs it lays.