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+ In some parts of the Pacific Ocean, sea urchins<\/strong> have eaten so much kelp that the kelp forests become urchin barrens.\n<\/p>\n <\/p>\n + His work with sea urchins<\/strong> showed that it was necessary to have all chromosomes present in order for proper development of the embryo to take place.\n<\/p>\n <\/p>\n + Species that feed on sea grass include green turtles, dugongs, manatees, fish, geese, sea urchins<\/strong> and crabs.\n<\/p>\n <\/p>\n + Spiny lobsters tend to live in crevices of rocks and coral reefs, only occasionally venturing out at night to seek snails, clams, crabs, sea urchins<\/strong> or carrion to eat.\n<\/p>\n <\/p>\n + Even sea otters like red sea urchins<\/strong><\/strong> more than they like purple sea urchins<\/strong><\/strong>.\n<\/p>\n + Typical sea urchins<\/strong> have spines that are long.\n<\/p>\n <\/p>\n + Many species feed on sea grasses, such as green turtles, dugongs, manatees, fish, geese, swans, sea urchins<\/strong> and crabs.\n<\/p>\n <\/p>\n + In places where sea otters have returned, like Juan de Fuca Strait, they ate enough sea urchins<\/strong> that the kelp forests grew back.\n<\/p>\n <\/p>\n + They also eat crustaceans such as crabs and shrimp, Molluscamolluscs, worms, sea urchins<\/strong> and small fish.\n<\/p>\n <\/p>\n + Some companies hired red abalone divers to collect purple sea urchins<\/strong> and bring them to controlled sea ranches where they could be fed until they were healthy enough to sell for human use.\n<\/p>\n <\/p>\n + The warm water also made it easier for the sea urchins<\/strong> to reproduce, so they had many more young than usual.\n<\/p>\n <\/p>\n + When purple sea urchins<\/strong> run out of food, they try to eat each other, and then they become dormant, as if sleeping.\n<\/p>\n <\/p>\n![\"sea](\"https:\/\/englishteststore.net\/blog\/wp-content\/uploads\/2021\/09\/sea-urchins-in-sentences.jpg\" "\\"sea")
Example sentences of “sea urchins”:<\/h2>\n