In the past, species of sponges, cnidarians, and ctenophores were referred to as "lower" or "primitive" animals because of their relatively simple body plans and lack of any sophisticated organ differentiation
Which of the following suggest that the terms "lower" or "primitive" are
not useful as descriptors for these organisms?
A. Many members of these groups are active
predators and feed on other organisms.
B. These groups have been around for
millions of years, so their evolutionary path
has been successful in spite of limited
complexity.
C. These groups are not primary producers,
so should not be classified as "lower"
because they occur higher on the trophic
pyramid.
D. These groups harbor a lot of genetic
variation; "lower" groups would have less
evolved genomes.
B
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What naturally occurring process is responsible for keeping the earth warm enough to sustain life?
A. Oceanic currents B. Increasing biodiversity C. Greenhouse effect D. Variable microclimates E. Atmospheric circulation
Most geneticists would agree that human races are distinct genetic entities
a. True b. False Indicate whether the statement is true or false
Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
Based on the graph below, what are the optimal temperatures for the human enzyme and the hotsprings prokaryote enzyme?
A. The optimal temperature for the human enzyme is 46°C; the optimal temperature for the hotsprings prokaryote enzyme is 79°C. B. The optimal temperature for the human enzyme is 35°C; the optimal temperature for the hotsprings prokaryote enzyme is 65°C. C. The optimal temperature for the human enzyme is 40°C; the optimal temperature for the hotsprings prokaryote enzyme is 72°C. D. The optimal temperature for the human enzyme is 30°C; the optimal temperature for the hotsprings prokaryote enzyme is 60°C.