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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.

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

amphibians: The class of vertebrates that contains the frogs, toads, newts, and salamanders.

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.

algae: An umbrella term for various simple organisms that contain chlorophyll (and can therefore carry out photosynthesis) and live in aquatic habitats and in moist situations on land. Algae range from macroscopic seaweeds such as giant kelp, which frequently exceeds 30 m in length, to microscopic filamentous and single-celled forms such as Spirogyra and Chlorella. For example, if a gene determines the seed color of peas, one allele of that gene may produce green seeds and another allele produce yellow seeds.

Also used to describe the process of genetic change within a population, as influenced by natural selection.

The eggs are soft and vulnerable to drying, therefore reproduction commonly occurs in water.

Amphibian larvae are aquatic, and have gills for respiration; they undergo metamorphosis to the adult form.

amniotes: The group of reptiles, birds, and mammals.

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

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