Identical twins have more similar sleep patterns than do fraternal twins, and north americans are averaging less sleep than their counterparts of a century ago. these facts best illustrate that sleep patterns are affected by both

Heredity and Environment

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the cell theory states that all living things including animals, as well as plants, are made of cells.

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.