Difference between absolute and relative dating of rocks

19-Sep-2019 23:49

These all develop through an embryo that is enclosed within a membrane called an amnion.

The amnion surrounds the embryo with a watery substance, and is probably an adaptation for breeding on land.

amino acid sequence: A series of amino acids, the building blocks of proteins, usually coded for by DNA.

Exceptions are those coded for by the RNA of certain viruses, such as HIV.

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The amphibians evolved in the Devonian period (about 370 million years ago) as the first vertebrates to occupy the land.

Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.

adaptive radiation: The diversification, over evolutionary time, of a species or group of species into several different species or subspecies that are typically adapted to different ecological niches (for example, Darwin's finches).

In a diploid cell there are usually two alleles of any one gene (one from each parent).

Within a population there may be many different alleles of a gene; each has a unique nucleotide sequence.

The amphibians evolved in the Devonian period (about 370 million years ago) as the first vertebrates to occupy the land.

Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.

adaptive radiation: The diversification, over evolutionary time, of a species or group of species into several different species or subspecies that are typically adapted to different ecological niches (for example, Darwin's finches).

In a diploid cell there are usually two alleles of any one gene (one from each parent).

Within a population there may be many different alleles of a gene; each has a unique nucleotide sequence.

The diameter of the aperture determines the intensity of light admitted. archeology: The study of human history and prehistory through the excavation of sites and the analysis of physical remains, such as graves, tools, pottery, and other artifacts.