What component of Earth’s atmosphere exists entirely as a result of photosynthesis? oxygen gas
water vapor
nitrogen gas
carbon dioxide gas

Oxygen

Explanation: Oxygen is primarily produced by photosynthesis.

oxygen gas

Explanation:

during the process of photosynthesis in plants the final product is oxygen gas

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.