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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..
Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..
This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..
Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..