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They became extinct in the mass extinction at the end of the Ordovician Period.
Because bears are part of the ecosystem and removing them messes up everything. Bears control the amount of fish or seals in the water. If bears go extinct, seals will take over the water, eating all the fish. When all the fish are gone, the seals will die of starvation. If the bears go extinct, more animals will go extinct too.
65 Million years ago, in the Cretaceous time period.
It would become easier prey, and quite possibly go extinct.
The fish population goes into decline and the fish species may go extinct.
They are almost extinct because of the stupid dams. The salmon have trouble getting over them.
when people over fish then we could run out of fish. IF we extinct one thing then alot of thing can go if krill go shark whales will die if certain fish die bigger fish die it is all part of the food chain.
What will happen is that people will start to lose their jobs because people are over fishing, like butchers need fish to sell and when theirs no fish they wont have any to sell so that will make the money go down, and then we wont have fish to eat anymore.
Without mangroves many fish, shore animals and birds would go extinct.
They could go extinct.
Why did the dinosaurs go extinct? Humans will never go extinct!
Well, I wouldn't be to happy, I like salmon! Their predators would die out and their prey would thrive. People would have to catch more of other fish so those fish would eventually become extinct... Basically, nothing good. And the worst part is, NO MORE SALMON FOR DINNER!!!! WAAAAAHH