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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..
This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..