Answer:
Photosynthesis expelled oxygen, which because ozone molecules are made up of 3 oxygen atoms, built up the ozone layer.
Step-by-step explanation:
The ozone layer is a region of the Earth's atmosphere that contains a high concentration of ozone. Ozone is a molecule made up of three oxygen atoms, and it is highly reactive and protective, absorbing much of the ultraviolet radiation that reaches the Earth's surface. The ozone layer helps to protect life on Earth by shielding it from the harmful effects of ultraviolet radiation.
Early life played an important role in the creation of the ozone layer. One of the key sources of ozone in the atmosphere is molecular oxygen, which is produced by photosynthetic organisms, such as plants and algae. These organisms use energy from the Sun to convert carbon dioxide and water into oxygen and glucose. This process, known as photosynthesis, releases molecular oxygen into the atmosphere, where it can react with ultraviolet radiation to form ozone.
In addition to photosynthesis, early life also played a role in the creation of the ozone layer through the process of respiration. During respiration, organisms convert glucose into energy and release carbon dioxide and water as waste products. This process also consumes oxygen, which can react with ultraviolet radiation to form ozone.
Overall, early life played a critical role in the creation of the ozone layer through the processes of photosynthesis and respiration. These processes helped to create and maintain the ozone layer, which is essential for protecting life on Earth from the harmful effects of ultraviolet radiation.