The maintaining of an organism's metabolic rate is affected by abiotic factors such as temperature, pHScale of acidity or alkalinity. A pH (power of hydrogen) value below 7 is acidic, a pH value above 7 is alkaline. and salinityThe saltiness of a body of water, which may become higher in areas of high evaporation
Organisms can be categorised into two broad groups – conformers and regulators.
conformers - dependent upon the changes in the external environment
regulators - can control their internal environment regardless of external environmental change