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?
◦ It is likely higher than that of an adult human because the seal needs access to less oxygen when diving.
◦ It is likely higher than that of an adult human because the seal needs access to more oxygen when diving.
◦ It is likely lower than that of an adult human because the seal needs access to less oxygen when diving.
◦ It is likely lower than that of an adult human because the seal needs access to more oxygen when diving.
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A Drosophila embryo and (b) the adult fly that develops from it