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www.reference.com/article/life-cycle-frog-f8bd2d3fa472267

The life cycle of a frog begins first as an egg, then develops into a tadpole, a tadpole with legs, a froglet and then a full grown frog. For most species of frogs, the entire growth process takes around 12 to 16 weeks to complete.

www.reference.com/article/human-life-cycle-2828d4f916244b27

The human life cycle begins at fertilization, then birth, and progresses through infancy, childhood, puberty, adulthood and aging, ending in death. Every stage is unique and encompasses changes in the human body.

www.reference.com/article/life-cycle-dog-a56d86383978387a

A dog's life cycle begins at puppyhood and spans an average of 12 years, although some dogs live considerably longer. The female dog generally become sexually mature by age one and can begin reproducing after that time if not spayed.

www.reference.com/article/life-cycle-cat-b7e9f841ef0f1f5f

Kittens are heavily reliant on the mother for the first few weeks after they're born, and they cannot see or hear. They learn to walk at three weeks, and learn to respond to other cats. They have full coordination at seven weeks, and can become fully independent by 12 w...

www.reference.com/article/life-cycle-spider-622260cd2b08c165

The lifecycle of a spider begins with the laying and hatching of the eggs, moves to the development of the spiders and ends with the spider's reproduction, according to Brandeis University. Spiders are known for their web building, and each spider species uses its webs ...

www.reference.com/article/life-cycle-lizard-d289743fd3bce7b9

The life cycle of a lizard ranges from 3 to 50 years. Longevity depends on the species in question.

www.reference.com/article/life-cycle-pumpkin-92298e59db0e8553

A pumpkin begins life as a seed, which holds an embryo. If the seed is planted and watered, it germinates into a seedling, which grows into a vine with male and female flowers. If the female flower is successfully pollinated, a fruit grows from the ovary.