Question

Definition of respiration

Answer 1

1. 

the process in living organisms of taking in oxygen from the surroundings and giving out carbon dioxide (externalrespiration). In terrestrial animals this is effected by breathing air

2. 

the chemical breakdown of complex organic substances, such as carbohydrates and fats, that takes place in the cells and tissues of animals and plants, during which energy is releasedand carbon dioxide produced (internal respiration)

Answer 2

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=> This is a process in living organisms connects each other for exchange of gases .humans inhale oxygen and release carbondioxide ,these carbondioxide takes by plant and release oxygen.

=> this is also a process in which we take oxygen from outside of our body and use it in the process of breakdowning organic compounds and supplies proteins to the body called oxidising