When imbalances occur in the sex ratio of sexual species that have two sexes (that is, other than a 50:50 ratio), the members of the minority sex often receive a greater proportion of care and resources from parents than do the offspring of the majority
sex. This is most clearly an example of _____.
A) sexual selection
B) disruptive selection
C) balancing selection
D) stabilizing selection
E) frequency-dependent selection
Answer: E
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Darwin and Wallace's theory of evolution by natural selection was revolutionary because it _____
A) was the first theory to refute the ideas of special creation B) proved that individuals acclimated to their environment over time C) dismissed the idea that species are constant and emphasized the importance of variation and change in populations D) was the first time a biologist had proposed that species changed through time
Members of the phylum ____ exhibit radial symmetry, with their body parts arranged regularly around
a central axis.
a. Porifera b. Mollusca c. Cnidaria d. Platyhelminthes e. Chordata
Weight loss dieting in humans has been shown to
a. increase absolute abundance of Firmicutes bacteria b. decrease absolute abundance of Firmicutes bacteria c. increase relative abundance of Firmicutes bacteria d. decrease relative abundance of Firmicutes bacteria e. not affect bacterial populations in human intestines
Which of the following provides O2 as an end product?
A) Light-independent reactions B) Glycolysis C) Cellular respiration D) Light reactions E) Synthesis