Terrestrial biomes are defined by the dominant plant type. Biomes are products of climates, soil types, chance, and history. Ecosystems include producers, consumers, and decomposers. Ecosystems are extremely complex and interlinked. Intervention usually has unforeseen consequences.
Water is a polar molecule.
Oxygen holds electrons more tightly than does hydrogen. Oxidation-reduction reactions occur as electrons move from one atom to another. They must obtain energy and nutrients from the environment and release waste products and heat. Physical factors can determine the range of a species. The earth's surface is unevenly heated by the sun.