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Species adapt when succeeding generations emphasize beneficial characteristics.

agnostic: A person who believes that the existence of a god or creator and the nature of the universe is unknowable.

adaptation: Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment.

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

allometry: The relation between the size of an organism and the size of any of its parts.

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

ammonoid: Extinct relatives of cephalopods (squid, octopi, and chambered nautiluses), these mollusks had coiled shells and are found in the fossil record of the Cretaceous period.

For example, an allometric relation exists between brain size and body size, such that (in this case) animals with bigger bodies tend to have bigger brains.

Allometric relations can be studied during the growth of a single organism, between different organisms within a species, or between organisms in different species. amino acid: The unit molecular building block of proteins, which are chains of amino acids in a certain sequence.amniotes: The group of reptiles, birds, and mammals.These all develop through an embryo that is enclosed within a membrane called an amnion.The amphibians evolved in the Devonian period (about 370 million years ago) as the first vertebrates to occupy the land.They have moist scaleless skin which is used to supplement the lungs in gas exchange.allopatric speciation: Speciation that occurs when two or more populations of a species are geographically isolated from one another sufficiently that they do not interbreed. There are 20 main amino acids in the proteins of living things, and the properties of a protein are determined by its particular amino acid sequence.

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