What is Respiration?? Plz Help Me In Detail For Class 9

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Respiration is a cellular process. Meaning , it only occurs in the cells of the living organism. Basically it is a biochemical process in which cells use oxygen and glucose supplied from nutrients , and combine the oxygen and glucose , and after combining them , it releases energy in the form of carbon dioxide , water and ATP molecule.  

Also , respiration can also be done without oxygen called anaerobic respiration.

Respiration done with oxygen is called aerobic respiration

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plant because they survive by water, sunlight, ex.

explanation:

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: