Question

homeostasis is the process by which organisms maintain a stable environment.
feedback mechanisms amplify or increase the effects of the initial stimulus.
in contrast, negative feedback mechanisms work to counteract or the effects of the initial stimulus.
to maintain homeostasis, the cell membrane, a semi - permeable, controls which substances can enter or leave the cell.
endocrine and nervous systems are examples of systems that work together to maintain in the body
passive transport, like osmosis, allows molecules to move from areas of concentration to areas of lower concentration.
in contrast, active transport requires to move molecules against a concentration gradient.
organisms have evolved specific mechanisms to cope with changes in their conditions.
the internal balance of an organism, from the cellular level to the whole body, is crucial for and reproduction.

Explanation:

Homeostasis is the maintenance of a stable internal environment. Positive feedback amplifies the initial stimulus, while negative feedback counteracts it. The cell - membrane is a barrier controlling substance entry/exit. Endocrine and nervous systems maintain homeostasis in the body. Passive transport is down the concentration gradient, and active transport requires energy to move against it. Organisms have evolved mechanisms for environmental changes, and internal balance is crucial for survival and reproduction.

Answer:

1. internal
2. Positive
3. reduce
4. barrier
5. homeostasis
6. higher
7. energy
8. external
9. survival