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Cell wall:

Only present in plant cells, it provides structure and is completely permeable to biological molecules.

Cell membrane:

Much thinner than cell wall and is p...

Dominant alleles need the presence of only one copy to ach...

If body temperature is too high:

Capillaries dilate, increasing the blood supply to the skin and allowing heat to be lost from the body by radiation.

If body temperature is t...

Mitochondria are a fascinating organelle, which we, as humans, rely on for so much. They are where the electron transport chain occurs, where ADP is conv...

Natural Selection is the accepted theory of evolution first postulated by Charles Darwin and can be thought of as 'survival of the fittest'. It is the process by which a species gradually evolves thro...