And are two ways that substances pass through a cell membrane out of the cell.

Why does the skin of your finger shrink when you wash clothes for a long time?

How can you approximate the number of calories required to keep you in energy balance?

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy