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Animals have been on the earth from the Cambrian period of 570 to 500 million years ago. During this time life was abundant, but only in the sea. The Ordovician period 500 to 430 million years ago, the first fish came about. The period of 430 to 400 years called the Silurian period life began to move on land. Animals have lived in remote places across the earth. We cannot think of a place that animals have not lived during Earth's history. Animals live in the sea. Aquatic life refers to animals that live in the water. Animals live on the land. Terrestrial refers to animals that live on the land. In jungles, rainforests, deserts, tundra's, icy cold region's animals can all be found, whether vertebrates or invertebrates, mammals or non-mammals. Those who have pets, animals live in your home. Even in our backyards animals live. Animals are all around. In the coldest regions of the earth animals are there. Each animal lives in a habitat that is suitable for them.
