Which vitamin enhances calcium absorption?
a. A
b. C
c. D
d. E
e. K
C
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Among which of the following will sexual dimorphism lead to females being larger than
males?
a. among species where males physically fight for access to females b. among species where a male must guard a female to prevent other males from mating with her c. among species where males have to walk long distances to find females but fighting is rare d. Females being larger than males is always beneficial because it leads to higher fecundity.
The members of this subphylum have a three-part body plan: a head, thorax, and abdomen. Among
other structures, their head has one pair of antennae and a pair of mandibles, and their thorax has three pairs of walking legs and often one or two pairs of wings.
a. Myriapoda b. Trilobita c. Chelicerata d. Hexapoda e. Crustacea
For a span of 248 mya to 65 mya, the Mesozoic era, in which dinosaurs appeared, dominated, and became extinct, lasted approximately ___ of the geologic timescale.
A. 4% B. 50% C. 7% D. 20% E. 15%
When a bacteria cell lacks necessary nutrients, it becomes an ______. When it gains enough nutrients, it can become a ______.
Fill in the blank(s) with the appropriate word(s).