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There is variation naturally present between members of a species. These variations can prove advantagous, thus making an individual in a species better adapted for survival. For example, giraffes with a lon...

Respiratory surfaces must be thin (such as in alveoli which have walls that are 1 cell thick) to create a small diffusion distance for the gases to be exchanged through. They must also have a large surface a...

Respiration releases Energy(1), Energy in the form of ATP(1) and this is needed for life of an organism to bring about various moments and growth (1).

Osmosis is a process whereby molecules of a higher concentration go to an area of a lower concentration. For instance, if you have a bag made of porous material, such as cellulose, you fill it with orange ju...

First of all, once proteins reaches stomach, HCL (Hydrochloric acid) due to its high acidity partially denatures proteins and activates pensinogen (secreted by the gastric glands) into an enzyme pepsin. Whic...