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  Hormones in Animals Endocrine System:  The endocrine system is composed of several endocrine glands.  A ductless gland is called an endocrine gland . The endocrine gland secretes its product directly into the bloodstream. Hormones are produced in the endocrine glands. Hormone is mainly composed of protein. Hormones assist the nervous system in control and coordination. The nervous do not react to every nook and corner of the body and hence hormones are needed to affect control and coordination in those parts. Moreover, unlike nervous control, hormonal control is somewhat slower. Exocrine Gland:   Exocrine glands are glands that discharge secretions using ducts, which open onto an epithelial surface. Hormones:  These are the chemical messengers secreted in very small amounts by specialised tissues called ductless glands. They act on target tissues/organs usually away from their source. Endocrine System helps in control and coordination through chemical compound...

 Life Processes The maintenance of living organisms is essential even if they are moving, resting, or even sleeping. The processes that together maintain life are known as life processes. The various life processes which take place in living organisms are called metabolic activities or metabolism. These life processes can either be anabolic or catabolic in nature. Nutrition, respiration, transportation, and excretion are some of the life processes that are essential for the functioning as well as maintenance of living organisms. Life Processes Nutrition Nutrition is defined as a process by which living organisms procure food or synthesize it and convert it into simple absorbable form by a series of biochemical processes. Nutrient can be defined as a substance that an organism obtains from its surroundings and use as a source of energy as well as providing raw materials for the biosynthesis of body constituents. There are two basic modes of nutrition: autotrophic and heterotrophic. ...

  Sex Determination in can organism  very based on defferent machanism : .   Temprature -dependent   * Determination :In some reptiles , the temperature at which the fertilized eggs are incubated influences the sex  of the offspring  Environmental influences : In snails sex can change based on environmental factors  Sex Determination :In human determination is  by genetics : Chromosomes and traits : *Human have 23 pairs of chromosomes . * 22pairs are responsible for determining various traits  * The 23rd , pairs know as sex  chromosomes determining the sex of the individual . Sex Chromosomes :    Females have  tow identical X chromosomes(xx). Males have one X and one Y chromosomes (XY).