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Overview of types of immune responses. Difference between innate and adaptive immunity. Differences between humoral adaptive immunity and cell-mediated adaptive immunity.

These three short online lessons discuss asteroids, comets and meteors.

Patterns and processes of evolution. How evolution and natural selection are reflected in the similarities and differences of organisms. 

This online resource discusses the distribution of earth's water.

These two short online tutorials discuss how the earth rotates and then the earth's revolutions.

In the first URL, the YouTube video explains why earth has spring, summer, autumn and winter seasons. The second URL summarizes the key takeaway points.

This online tutorial will explain the earth's shape and its hemispheres.

This online article delves into our the sun and planets were formed.

These four short online lessons will cover the following:

• The planets of the solar system
• Planet orbits in the solar system
• Gravity in the solar system
• Inner vs outer planets

This YouTube video will guide you through a fun activity where you will draw the earth's continents and oceans.