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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..
Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..
Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..