2changes when going from low power to high on a microscope

Oil Immersion Higher magnification means the light is bent more. At a certain point, the light is bent so much that it can't make it through the objective lens. At that point – usually around 100x for standard lab microscopes – you'll need to put a drop of oil between your specimen and the objective lens.

Explanation:

b. the carbon cycle ensures living things have a source of hydrogen

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