Which of the following best explains why regulating opening and closing stomata is more difficult in dry and hot environments?
a. Photorespiration becomes a bigger problem as the climate becomes colder.
b. Photorespiration becomes a bigger problem as the climate becomes warmer.
c. Photorespiration becomes a lesser problem as the climate becomes warmer.
d. Photorespiration becomes a lesser problem as the climate becomes colder.
Ans: b. Photorespiration becomes a bigger problem as the climate becomes warmer.
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Nematodes
A. are roundworms. B. are found in the gastrointestinal tract or the blood. C. are carried by bacteria. D. have flat segmented bodies. E. are roundworms AND are found in the gastrointestinal tract or the blood.
Which group has six legs and two antennae?
a. crustaceans c. spiders b. insects d. horseshoe crabs
Habitat fragmentation can reduce biodiversity by
a. creating patches too small to maintain optimal breeding conditions. b. increasing the effects of chemical pollution. c. eliminating vast tracts of forests. d. introducing exotic species into a habitat. e. doing all of these.
Which extinct hominin first appeared about 1.9 million years ago and had a larger brain than Homo habilis, its immediate predecessor?
A) Homo ergaster B) Homo neanderthalensis C) Homo sapiens D) Australopithecus