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In most food chains, all of the energy which is used originally comes from the sun. Plants are "photoautotrophs", which means that they can use light energy from the sun to fuel their life proce...

Enzymes are biological catalysts that work by increasing the speed of a reaction, without being altered or used up in the reaction. Each enzyme has an active site specific to a particular substrate and th...

Receptors in the skin detect changes in the environment, so called stimuli. These could include a change in temperature or sensation, such as increased pressure, being touched somewhere or experiencing pa...

It is the process which uses Carbon dioxide, Water and sunlight to produce Sugar (glucose) and oxygen.

Oxygen is used in aerobic respiration. More energy is generated in aerobic respiration. Carbon dioxide and water are products of aerobic respiration, whereas lactic acid is the end product of anaerobic re...