Answer:
open system
Explanation:
An open system is a system in which both energy and matter are exchanged with the surroundings.
A combination reaction (also known as a synthesis reaction) is a reactionwhere two or more elements or compounds (reactants) combine to form a single compound (product). Such reactions may be represented by equations of the following form: X + Y → XY.
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The three inputs of photosynthesis are carbon dioxide, water and sun light
If you’re talking about noble gases, the answer would be A. Since noble gases already have 8 electrons, they don’t tend to form chemical bonds. And elements need just 8 electrons on there shells to be stable.
