"An explanation of life cycles of different types of plants and animals, as well as people"--Provided by publisher.

What is a life cycle? -- Why do birds lay eggs? -- Why do ducklings swim in a line? -- How do ducks find a mate? -- Why do fish lay so many eggs? -- How do tadpoles turn into frogs? -- How do caterpillars turn into butterflies? -- Which animals feed on their mothers milk? -- Why do kangaroos have pouches? -- How are seeds fertilized? -- How do seeds grow? -- Do humans have a life cycle too?