There are two primary requirements food and safety for which animals compete with each other. In the course of time the animals becomes adapted to all possible conditions of life on earth, water and air. These adaptations are manifested is various structural modifications which enable their possessors to survive the competition.
Adaptations can be classified under four headings:
I.Structural Adaptations
II.Physiological Adaptations
ADVERTISEMENTS:
III. Protective Adaptations
IV. Animal Associated Adaptations.