photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
1. Testing only one variable
A controlled variable means its the one that stays the same. In a controlled experiment, it means there is only one manipulated, (changed) variable.
1. Some enzymes catalyze reactions that can run in either direction.
2. A product in one process may be a reactant in the next process.
Your answer will be c) when there was no life on Earth
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For fermentation to occur, there must be yeast (yeast provides enzymes that are catalysts for the reaction). It is an anaerobic reaction, so it does not require oxygen. Fermentation is usually done in a closed container.