Questions: What term is used to describe the state in which molecules are evenly distributed in the available space? 1) Osmosis 2) Equilibrium 3) Diffusion 4) Apoptosis

The answer is the second one (2): Equilibrium.

Explanation for each option:

1. Osmosis: This is the process by which water molecules move across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. It is not the term used to describe the state in which molecules are evenly distributed.
2. Equilibrium: This term describes the state in which molecules are evenly distributed in the available space, meaning there is no net movement of molecules in any particular direction.
3. Diffusion: This is the process by which molecules move from an area of higher concentration to an area of lower concentration. While diffusion leads to equilibrium, it is not the term used to describe the final state.
4. Apoptosis: This is the process of programmed cell death and is unrelated to the distribution of molecules in space.

Summary: The term used to describe the state in which molecules are evenly distributed in the available space is equilibrium.