Homeostasis across a cellular membrane the same as equilibrium the ability to maintain nutrient concentrations equal on both sides of the cell membrane the ability to maintain cellular conditions over time a function of proteins.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

Why do mountaineers become breathless as they reach high altitudes