Which is the most diverse group of seedless vascular plants?
a) the liverworts
b) the horsetails
c) the club mosses
d) the ferns
Ans: d) the ferns
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Who were the first hominids thought to wear clothing, build fires, and live in caves or shelters?
a. Homo sapiens b. Australopithecus africanus c. Australopithecus afarensis d. Homo habilis e. Homo erectus
A child may be given the vaccine for chickenpox. If the child goes to school and plays with other children who have the chickenpox virus, the vaccinated child will not get sick. Why is this?
A) Vaccines act like antibiotics so that any organism in the body will be destroyed before the immune system has to respond. B) Vaccines introduce a friendly virus into cells so they cannot be infected with a second virus. C) Vaccines produce a primary response in which memory cells are generated that respond rapidly in a second exposure. D) Vaccines stimulate macrophages to work extra hard to fight infections.
Figure 22.2
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Questions refer to the above figure.
In the accompanying figure, which phase makes up most of the plant body of angiosperms?
A. 1 B. 2 C. 3 D. 4 E. 5
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds have the most visual sensitivity to the color red. Following their breeding season, these species of hummingbirds are
A. allopatric. B. sympatric.