Water makes up a large percentage of the body’s cells. for a cell to remain in homeostasis, there must be a mechanism to control water changes in the cells. the movement of water from an area of high water concentration to an area of low water concentration is diffusionosmosisactive transportstable transport.

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.