Single-celled organisms do not need organ systems. Why not?

Each organ system in the body has a specific job to do for the organism. ... A unicellular organism must perform all functions necessary for life. • A multicellular organism has specialized cells, tissues, organs, and organ systems that perform specific functions.

Explanation:

a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.

answer; a muscle cell, another neuron and a of the above