The fetus primarily gains weight during the third-trimester.
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The six most important characteristics of a civilization are cities, government, religion, social structure, writing, and arts and architecture.
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Hormones, Cell receptor and glands
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:/ what about it? is this your question? if so you need to add more detail then that so people know what your talking about
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Evidence for evolution comes from many different areas of biology:
Anatomy. Species may share similar physical features because the feature was present in a common ancestor (homologous structures).
Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.
Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.
Fossils. Fossils document the existence of now-extinct past species that are related to present-day species.
Direct observation. We can directly observe small-scale evolution in organisms with short lifecycles (e.g., pesticide-resistant insects).
