both immigration and births add individuals to a population.
The remains of the living organisms used in understanding the history of life on Earth is fossils.
Fossils are the preserved remains of plants and animals whose bodies are buried in sediments such as sand and mud under ancient seas, lakes and rivers.
Fossils are the geologically altered remains of once-living organisms and/or their behavior. There are mainly two types of her: Body fossils represent all or part of an organism's body, while vestigial fossils show an organism's behavior.
Fossils form in a variety of ways, but most often form when living organisms (such as plants or animals) die and are quickly buried by sediment (such as mud, sand, or volcanic ash).
Fossils are found mainly in river valleys, cliffs and hills where sedimentary rocks of appropriate age are exposed, and in areas of human exposure such as quarries and road cuttings.
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A heterozygous genotype has one capital and one lowercase letter.
