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Fish
The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..
Origins of Life on Earth
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Stems
Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..
Principles of Hormonal Control Systems
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..
Cell Respiration
Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stag..
Respiration
The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..