Scientists speculate that extinctions did not occur in Africa as they did on other continents because animals coevolved with _______ in Africa.
A. plants
B. diseases
C. parasites
D. humans
D. humans
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There are seemingly conflicting studies that have taken a look at whether Neanderthals interbred with human ancestors. One study of mitochondrial DNA suggests that the two groups did not interbreed
Another study, of the whole genome, suggests that they did. Which of the following could explain these results? A. Taking a look at the whole genome is much more reliable than looking at mitochondrial DNA. B. Mitochondrial DNA is more susceptible to mutations than nuclear DNA so more change would be expected. C. Mitochondrial DNA is passed on the maternal side, so if Neanderthal females did not interbreed with our ancestors, Neanderthal mitochondrial DNA would never have entered the modern human gene pool. D. Genomic DNA is more susceptible to mutations than mitochondrial DNA, so more change we be expected. E. None of the answer options is correct.
Which of the following provides the likeliest explanation for the differences seen in the human population?
A. presence of parasites in different areas B. amount of sunlight in different areas C. the altitude in different areas D. natural selection
Chloroplasts arose by endosymbiosis of ______.
A. an aerobic bacterium B. a photosynthetic bacterium C. an anaerobic bacterium D. an aerobic archaeon E. a photosynthetic archaeon
Molecular data confirm that cnidarians branched off from the rest of animals before ________ evolved.
A. bilateral symmetry B. arthropods C. Porifera D. echinoderms E. mollusks