Answer:

1. Homeostasis is the state of steady internal, physical, and chemical conditions maintained by living systems. This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits.
2. The endocrine and central nervous systems are the major control systems for regulating homeostasis.
3. Fluids and electrolytes, Energy and nutrition, and Immune response mediators.
4. Homeostasis typically involves negative feedback loops that counteract changes of various properties from their target values, known as set points. In contrast to negative feedback loops, positive feedback loops amplify their initiating stimuli, in other words, they move the system away from its starting state.

Explanation: