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A stimulus (for example a pin) stimulates the receptor which causes a nerve impulse in the sensory neuron. The impulse travels to a synapse in the spinal cord, where chemicals diffuse across the gap in th...

The rate of chemical reactions within the body.

Okay, so here we have what seems like a very daunting​ list of chemical reactions to remember that don't seem to make any sense! But don't worry​, with practice you wi...

Muataions within genes can be caused by several ways. 

Sometimes they can be spontaneous or other times they can be induced by environmental factors. These factors can include chemicals s...