A molecule of H2o or Water
It is distinctive, widespread, abundant and limited in geologic time. Because most fossil<span>-bearing rocks formed in the ocean, the major </span>index fossils<span> are marine organisms. That being said, certain land organisms are useful in young rocks and in specific regions.</span>
DNA provides information at the species level.
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A heterozygous individual is someone who has one recessive and one dominant trait
ex: (Dh). D- black hair. d- blonde hair
The phenotype will be the one that belongs with the dominant trait (D) so the phenotype would be black hair.
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Diffusion. Diffusion is the movement of substances from an area of high concentration to a low concentration until the molecules are equally concentrated. It is a passive process.
