store, However, whales have a thick layer of fat that helps them ______ energy for long periods., whereas, ________ dolphins live in groups, some other marine mammals are more solitary., internal, The researchers examined the animal's ______ muscles to understand how it moves underwater., external, The ______ surface of the animal's body is covered with a thick layer of skin., adjust, The animal uses its flippers to ______ its body when swimming., range, Scientists are studying the ______ of marine mammals that can survive in cold water., limited, The species has a ______ habitat and is rarely found far from the coast., reveal, The study helped ______ the serious effects of pollution on the species., loss, The population has suffered a significant ______ over the past decade., decade, The number of these mammals has fallen dramatically during the last ______., capture, Scientists sometimes ______ animals in order to study their behaviour and later release them., entanglement, Fishing nets can cause serious ______ and lead to the death of marine mammals., legislation, New ______ was introduced to protect endangered species from hunting., strike, The animal can use its powerful tail to ______ an attacker., death, The researchers recorded the ______ of several animals after they became trapped in fishing nets., causes, Pollution is one of the main ______ of population decline among marine mammals., shape, The researchers measured the ______ of the animal's body before comparing it with other species., forelimbs, Marine mammals have different ______ depending on how they have adapted to their environment., bones, Some species have fewer ______ in their neck than humans., habitat, The animal's natural ______ is being destroyed by human activity along the coast.

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