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from eating plants and eating the animals that ate the plants

Explanation:

Plants take up nitrogen compounds through their roots. Animals obtain these compounds when they eat the plants. When plants and animals die or when animals excrete wastes, the nitrogen compounds in the organic matter re-enter the soil where they are broken down by microorganisms, known as decomposers.

From eating other plants and eating animals that ate plants

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when your a dog and you need a bone.   go and eat a rabbit

answer; coal reserves in the u.s are far greater than petroleum reserves;