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Scientists have found fossils of cyanobacteria that are more than 3.5 billion years old. How did these cyanobacteria help to change Earth’s early atmosphere to allow for the evolution of aerobic organisms?
A. Cyanobacteria added oxygen to Earth’s atmosphere through the process of photosynthesis.
B. Cyanobacteria added carbon dioxide to Earth’s atmosphere through the process of cellular respiration.
C. Cyanobacteria added methane to Earth’s atmosphere through the process of chemosynthesis.
D. Cyanobacteria added hydrogen to Earth’s atmosphere through the process of nuclear fission.

Respuesta :

Answer:

The answer is A.

Explanation:

Because they evolved to release oxygen through photosynthesis.

Through the process of photosynthesis, cyanobacteria added oxygen to the Earth's atmosphere. The correct option is A.

What is cyanobacteria?

Cyanobacteria are aquatic and photosynthetic, which implies they live in water and can make food. Since they are bacteria, they are tiny and usually unicellular, though they frequently grow in visible colonies.

Photosynthesis is the process by which cyanobacteria add oxygen to the Earth's atmosphere.

Thus, the correct option is A.

For more details regarding cyanobacteria, visit,

https://brainly.com/question/2516577

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