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Population Growth and Survivorship
Population Growth and Survivorship

This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..

Young plant growing from the soil.
Soils

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

Origins of Life on Earth
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..

"Cronopio dentiacutus", a prehistoric mammal (an illustration)
Mammalian Ancestors

Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..

Wart-like leaf galls on grape leaves
Plant Cell Defense

Plants protect themselves by releasing hydrogen peroxide to fight against fungal invasion. Another way is by secreting c..

Body temperature regulation by the hypothalamus
Temperature Regulation in Animals

This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..