Question

define passive transport. you may have to go back & rewatch part of the video. transport that always uses protein channels. transport that never uses energy. transport that never uses protein channels. transport that always uses energy. rewatch

Explanation:

Passive transport is the movement of substances across a cell membrane from an area of higher concentration to an area of lower concentration (down - the - concentration gradient). It does not require the cell to expend energy (ATP). Some forms like simple diffusion don't use protein channels, while facilitated diffusion can use them.

Answer:

Transport that never uses energy.