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What is Breathing?

Q. What is breathing? Ans. Breathing is an external process, in this process inhale of air and exhale of air. Or  Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.   Breathing is also known as external respiration. It is part of respiration but not internal or cellular respiration. The process of breathing does not fill the alveoli with atmospheric air during each inhalation (about 350 ml per breath), but the inhaled air is carefully diluted and thoroughly mixed with a large volume of gas (about 2.5 liters in adult humans) known as the functional residual capacity which remains in the lungs after each exhalation, and whose gaseous composition differs markedly from that of the ambient air . Physiological respiration involves the mechanisms that ensure that the composition of the fu
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What is Reproduction?



Reproduction in organisms
Re= again, Production=formation/produce

What is Reproduction?
Reproduction is the biological process by which new individual organisms – “offspring” – are produced from their “parents”.
Or
The creation by a life form of a similar life form is called reproduction.
Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction.
Why do organisms reproduce?
Organisms are reproduced for the continuity of life. Every organism has a fixed time period from birth to natural death is called “Life Span”.



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What is Respiration?

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Multiple Fission

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