Question

Cyanobacteria played a pivotal role in shaping the Earth by changing the composition of the atmosphere. Explain how the composition of the Earth’s atmosphere affects life on Earth.

a) By regulating temperature and preventing extreme heat
b) By providing a stable mix of gases essential for respiration
c) By creating a protective layer against harmful cosmic rays
d) By influencing the color of the sky during sunrise and sunset

Answer 1

The composition of Earth's atmosphere has a significant impact on life, including temperature regulation, respiration, and protection from cosmic rays. Cyanobacteria played a pivotal role in changing the atmosphere by producing oxygen through photosynthesis.

Step-by-step explanation:

The composition of Earth's atmosphere has a significant impact on life. It affects temperature regulation, provides essential gases for respiration, and creates a protective layer against harmful cosmic rays. Cyanobacteria played a crucial role in changing the composition of the atmosphere by producing oxygen through photosynthesis, leading to the evolution of other life forms.