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Why Do Some Stickleback Populations Lack Pelvic Spines

? Select all that apply. Pelvic spines are homologous to legs in four-legged animals and freshwater sticklebacks don't need hind limbs to move. In lakes with dragonfly larvae, pelvic spines can be disadvantageous, allowing the predatory larvae to grab the fish. Freshwater fish have evolved different types of protective armor to keep them safe from predators. In lakes where there are no large predatory fish, there is no advantage to having pelvic spines. In freshwater, a marine stickleback sheds its spines.
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In lakes with dragonfly larvae, pelvic spines can be disadvantageous, allowing the predatory larvae to grab the fish. In lakes where there are no large predatory fish, there is no advantage to having pelvic spines.
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