Which best defines homeostasis?   1. modifying the external environment2.  maintaining a stable internal environment3.  controlling what enters and exits the cell4.  movement of materials into the cell

The answer is (2) maintaining a stable internal environment.

Homeostasis is the process by which an organism tries to stabilise the internal body metabolism in response to external disturbances or changes. Example, when a person goes out into the snow, his body process will get overwhelmed by the sudden drop in the temperature. The body will try to stabilise its internal temperature by producing more heat in response to the cold exterior.

B. maintaining a stable internal environment

Explanation:

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).