Which of the following is present in fetal hemoglobin but not adult hemoglobin?
A) a-chains
B) b-chains
C) g-chains
D) none of these
C
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____ plants came to dominance in the Cretaceous
A)Land B)Leafy C)Green D)Flowering E)Tall
Which are mechanisms of heat transfer?
conduction convection radiation all of these
Increases in ocean temperatures often result in coral bleaching, in which
A) the symbiotic relationship between corals and their algae is disrupted. B) the calcium carbonate of corals is dissolved away, leaving only the soft animals behind. C) the water becomes so cloudy that no light can reach the symbiotic algae in corals. D) high levels of chlorine are released from the corals, killing the fish that swim by.
Organisms feeding on items on the seafloor that include detritus, decaying organic matter, waste products, and sediment are:
a) suspension feeders b) filter feeders c) deposit feeders d) tentacle feeders e) all of the above