There isn't much of a way to stop how low a certain animal's population gets in nature. Fishing also affects whales and dolphins who accidentally get caught in fishing nets. Between sport fishing and the need for electricity from our dams, many fish are killed and their populations become very low. Humans catch fish on their trips to the spawning grounds. If the fish can't get over the dams, they can't return to their spawning grounds where they were born, and they die before they lay their eggs. Without food and shelter, the animals may die.ĭams on the rivers can cause problems for fish returning to spawn. For example, the amount of certain types of animals decrease by forest fires destroying their homes. Other factors affect the balance of nature as well. As another example, if too many fish are caught or otherwise killed, there won't be enough left to lay eggs and have babies and they, too, may become extinct. For example, the deer, which can be prey to other animals and even humans, may face extinction because too many people hunt for deer for sport, food, and their skins for clothing. Our class talked about how the balance of nature controls both predator and prey populations. Without enough food, the predator's population may also die and both animals could become extinct. However, if one type of animal eats most of its natural prey, the prey's population goes down too far and recovering its population through natural reproduction may become a big problem. When nature is in balance the populations of the animals are controlled. The balance of nature is how animals depend on each other for food.
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