High energy electrons are highly reactive (Their energy can be used to make NADPH & ATP.)
For air masses to form fronts, they must collide with each other. B.
Answer: An Organ System
Explanation: Vascular plants have two distinct organ systems: a shoot system, and a root system. The shoot system generally grows above ground, where it absorbs the light needed for photosynthesis. The root system, which supports the plants and absorbs water and minerals, is usually underground.
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