Hematocrit is the percentage of red blood cells in the blood. In adult humans, hematocrit is roughly 40-45%, but it can be much higher or lower in other animals. Consider the Weddell seal, a mammal that can dive and hold its breath underwater for upwards
of 80 minutes. What is the hematocrit level of a Weddell seal, and why?
A) It is likely lower than that of an adult human because the seal needs access to less oxygen when diving.
B) It is likely lower than that of an adult human because the seal needs access to more oxygen when diving.
C) It is likely higher than that of an adult human because the seal needs access to less oxygen when diving.
D) It is likely higher than that of an adult human because the seal needs access to more oxygen when diving.
Answer: D
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