Most living things on earth have the ability to survive climate variations, so they possess a vital characteristic that can perform this ability. Unfortunately, only some animals can live in specific environments due to the lack of adaptive capacity in their genes. A normal frog can only survive in a humid environment due to its moist skin. If the frog is placed on a dessert, the frog's chance of survival is very low and it may die. These phenomena are not really due to the frog's dry skin, but the frog's internal body system cannot function well in a hot, dry atmosphere. According to Akin (2011), the important aspect for the survival of each species in various categories of biomes and aquatic environment is the ability to adapt to changes in the external environment and to control a coherent internal body system and regulation. Homeostasis is a regulation of the body's internal environment through a feedback mechanism consisting of a specific organic structure of the nervous and endocrine systems (Bailey, n.d.). Examples of homeostatic processes in the body include temperature regulation, maintenance of pH, fluid and electrolyte balance, blood pressure, and respiration. In this essay we will only cover temperature regulation or thermoregulation on animals. There are 4 distinct types of thermoregulation which include poikilotherm, homeotherm, ectotherm, and endotherm. Thermoregulation is actually the most vital and distinguishable form of homeostasis. Each type of enzyme within cells required an optimal temperature internally to remain functional (Shmoop Editorial Team, 2008). The first types of thermoregulation are poikilotherm. Poikilotherm is defined as an organism that can regulate its body temperature according to… middle of paper… animals, except mammals and birds, are ectotherms” (p. 286). To control their body temperature, some ectothermic animals adapt to a certain behavior. The lizard, a reptile, will find a sunny spot and then stretch out for maximum exposure to sunlight. If the environment becomes too hot, they will move between sun and shade (Starr, 2003). Examples of ectothermic animals are snakes, lizards and frogs. In conclusion, the four types of thermoregulation discussed are poikilotherm, homeotherm, endotherm, and ectotherm. Each of them has their own unique characteristics and their adaptation is mostly governed by their environment. This is a favorite example of the process of homeostasis because it allows certain organisms to survive in their hostile environment so that their genomic information can be passed on from their generation to the next.