The answer is a variable is what is measured or manipulated in an experiment. A dependent variable is what you measure in the experiment and what is affected during the experiment.
The three primary mechanisms by which molecules move across the cell membrane are :
- Passive transport, the movement of molecules that does not require energy
- Diffusion, when molecule move from higher concentration to lower concentration
- Osmosis, when molecule move to higher concentration
hope this helps
Oxygen and glucose are need for cellular respiration
B because a and c are incorrect and in letter d it states earth has no protection at all. And it DOES have protection B is most definitely true
Water (H2O) creates the medium in which chemical changes in the body occur.
