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Foreign cells that enter the body have antigens on the outside of them which will be complementary to a specific antibody. The antibody can bind to the antigen, forming an antigen-antibody complex, and th...

The key thing here is to note that both diffusion and osmosis are passive processes, and active transport is an active process. A passive process is one which does not require any energy in order to occur...

Photosynthesis has four stages:

1. Glycolysis. 

2. The Link Reaction.

3. The Krebs Cycle. 

4. Oxidative Phosphorylation...

Individuals within a population show a wide range of variation due to differences in their genes. The individuals within these species/populations with the characteristics most suited to their environment...

Glycolysis - 2 ATPs (net) are produced. 2 are input into the reaction and 4 are produced as a result.