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Offspring

when do birds migrate
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When Do Birds Migrate?

When Do Birds Migrate? Millions of birds of many different varieties migrate at the end of summer. With unfailing regularity they leave the

what is a mule
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What Is a Mule?

A mule is an animal that has a donkey for a father and a horse for a mother. Mules have no offspring of their own. It looks a bit like both

how does a seed become a tree
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How Does a Seed Become a Tree?

How Does a Seed Become a Tree? Inside a tree seed are the beginnings of the root, trunk, and leaves of a fully grown tree. They form the par