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Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

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Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

Ecosystem Succession
Ecosystem Succession

If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

Human Nervous System
The Human Nervous System

The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..

Developmental Biology
Developmental Biology

Developmental biology is a biological science that is primarily concerned with how a living thing grows and attains matu..