Seals such as the Weddell seal, which are capable of long and deep dives, typically have blood-oxygen carrying capacities (per unit volume) that are _______ those of seals such as the stellar sea lion, whose dives are short and shallow.

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Weddell seals, which dive long and deep, have evolved to have greater blood-oxygen carrying capacities than seals like the stellar sea lion, which dive short and shallow, but not as much as four times greater.

Seals Such as the Weddell Seal, Which Are Capable of Long