dictionary definition

① Morphological changes of some animals during individual development, for example, some insects (mosquitoes, flies, etc. ) goes through four stages: egg, larva, pupa and adult, which is called complete metamorphosis; Other insects (cicadas, locusts, etc. ) it becomes an adult directly without pupation, which is called incomplete metamorphosis; There are also some insects (lice, clothing fish and so on. After hatching from eggs, larvae are similar to adults in morphology and habits except for their small size and immature sex, which is called non-metamorphosis. In addition, frogs matured by tadpoles are also called metamorphosis.

(2) The phenomenon that the structure, morphology and physiological functions of roots, stems and leaves of some plants have changed specially due to long-term environmental influence. Such as potato tubers, cactus needle leaves and so on.

(3) refers to the abnormal physiological and psychological state of the human body (relative to the "normal state"): abnormal psychological ㄧ allergic reaction.

Animals:

A large class of organisms, mostly feeding on organic matter, have nerves, feelings and can exercise.

Physiology:

1. The principle of growth and reproduction.

2. The principle of health care.