The most likely explanation for why toothed whales have a blowhole is
A. they evolved from an animal with gills.
B. they evolved from an animal with nostrils.
C. blowholes are better for large animals.
D. blowholes are better for breathing underwater than gills are.
B. they evolved from an animal with nostrils.
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What does the term theory mean to a scientist?
A. A proposed explanation for an observed phenomenon B. A hypothesis that has been supported by a large number of experiments C. A hypothesis that has been supported by the evidence of one experiment D. A guess
Duplication of individual chromosomes instead of whole genomes can occur by ________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is NOT a domain?
A. Eukarya. B. Archaea. C. Protista. D. Bacteria. E. Both Bacteria and Protista.
The drug that is used to treat typhoid fever and brain abscesses, but can cause aplastic anemia, is ________.
A. chloramphenicol B. gentamicin C. ciprofloxacin D. clindamycin E. bacitracin