About 450 million years ago, the terrestrial landscape on Earth would have _____
A) looked very similar to that of today, with flowers, grasses, shrubs, and trees
B) been completely bare rock, with little pools that contained bacteria and cyanobacteria
C) been covered with tall forests in swamps that became today's coal
D) had non-vascular green plants similar to liverworts forming green mats on rock
Answer: D
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You are doing veterinary research on dog hormones. In your set of blood samples, you have one male dog with abnormally high levels of follicle-stimulating hormone and luteinizing hormone. What do you suspect may be the explanation for this outlier?
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