Diffusion is the movement of particles from a high concentration area to a low concentration area.
Things that can go through a membrane are ions (charged), small polar molecules. Big molecules can't go through the membrane due to its large size and disrupting the membrane.
Passive transport is the movement of substances acrpss the cell membrane w/o the use of energy. Active transport needs energy to move substances across a cell membrane.
The cell wall contains not only cellulose and protein, but other polysaccharides as well. The cell wall provides structural support and protection. Pores in the cell wall allow water and nutrients to move into and out of the cell. The cell wall also prevents the plant cell from bursting when water enters the cell.
Answer:
if you're looking for a minimum, people only need to eat every three day to survive, but the recommended amount of calories is 3000 calories a day for an average adult.
Explanation:
Un planeta cuya órbita se encuentra fuera del cinturón de asteroides se llama planeta exterior.
Ejemplos: Júpiter, Saturno, Urano y Neptuno
