Answer:
c. Glycolysis evolved in an oxygen-rich environment.
Explanation:
Glycolysis is the pathway that breaks down glucose into two molecules of pyruvate. It is a common pathway that is performed by both aerobic and anaerobic organisms. In aerobic organisms, glycolysis is followed by Kreb's cycle and electron transport chain. In anaerobic organisms, alcohol or lactic acid fermentation regenerate the NAD+ which is required to sustain glycolysis.
Therefore, glycolysis is independent of oxygen availability and can be performed under both aerobic and anaerobic conditions. This means that the pathway of glycolysis evolved under anaerobic conditions.
Explanation:
Each liquid falls somewhere along a scale with acid at one end and alkaline at the other. Normally, ocean water is less acidic than fresh water. Unfortunately, as the ocean absorbs more and more carbon dioxide from the atmosphere, it becomes more acidic. Lemon juice is an example of an acidic liquid.
Answer:
Water added
Explanation:
The above option is the best that represents the missing step.
This process is known simply to be cellular respiration. It is also the reverse of photosynthesis.
In this process, food is broken down in a chemical reaction with oxygen. As this process occurs, carbon dioxide and water are the products. So, in this process, water is added as the product of the breaking down process.
Respiration is seen to be almost the exact opposite of photosynthesis. These two reactions help to maintain biological energy balance on earth.
