Depending on the water regime, they developed different types of adaptations: morphological, physiological and behavioral.
Physiological adaptations include the features of vital processes that make up the deficit of moisture in the body. For example, mammals drink water, amphibians absorb it with skin. There are animals that can receive water through the oxidation of fats (oxidation of 100 g of fat gives 105 g of water). Therefore, abundant deposits of fat – the hump of a camel, the fat tail of a sheep – serve as original reservoirs of chemically bound water.
Morphological adaptations include devices that retain water in the body of animals. Insects and arachnids have a multilayered chitinized cuticle, reptiles have a horn cover (horny scales and plates), in terrestrial mollusks they have shells, in birds their bodies are covered with feathers, and in mammals their hair is covered.
Behavioral adaptations are that most animals are active in the search for water. They periodically visit watering places or migrate for dry periods to areas with higher humidity.
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