There is no part of the earth on which there is not some animal life. Some animals live at the north and south poles, where it is always frozen; some at the equator, where it is always hot. Some live in the depths of the ocean, and some on the peaks of the highest mountains. The surroundings in which an animal lives are called its environment. When an animal has special qualities that help it to stay alive in some particular environment, and that other animals do not have, it is said to be sp...
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