What occurs when a light wave enters a substance and its speed suddenly slows down?

That's due to the fact that light scatters off the molecules that make-up different materials. The photons themselves do not slow down.

Explanation:

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answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation:

answer; hydrologic cycle;