Polar bears are most closely related to brown (grizzly) bears and black bears because they share a common ancestor. All three species belong to the family Ursidae, and genetic studies have shown that polar bears and brown bears diverged from a common ancestor relatively recently in evolutionary terms. Sea otters and seals, on the other hand, belong to different families and are not closely related to polar bears.
Polar bears are most closely related to
1)sea otters and seals-because they live and feed in the ocean as well
2)brown(grizzly) bears and black bears-because they share a common ancestor
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