Life began in the sea billions of years ago. The first living things were bits of material that had the ability to reproduce themselves. Over time they evolved into organized groups of living materials called cells. In each cell various blobs of living material have various functions. Later cells evolved into organized collections of cells in which various cells had various functions. Eventually these collections of cells organized into organs which make up plants and later animals. Later, these sea animals evolved into various forms and eventually became fish. Later they evolved into reptiles and amphibians (like turtles) which live in the sea and also on land. Some reptiles evolved into completely land animals. Later mammals evolved on land, but a few species like the whales returned to the ocean.
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