Natural selection a process that occurs over successive generations and is defined as the differential reproduction of genotypes. Natural selection requires heritable variations in a given trait
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So where does the mass come from? The mass of a tree is primarily carbon. The carbon comes from carbon dioxide used during photosynthesis. During photosynthesis, plants convert the sun's energy into chemical energy which is captured within the bonds of carbon molecules built from atmospheric carbon dioxide and water.
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Digested food that is not need and is excreted out of the anus. Known as poop. Another waste is water that is not needed or it was already used and is let out of the penis or <span>Vagina</span>.
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limbs form the baby has fingers, hands,arms, feet and toes. they can now open and close their fists and mouth