The evidence for the origin of life came by the discovery of fossils of cyanobacteria.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks whether the statement about the discovery of fossils of cyanobacteria as evidence for the origin of life is true or false.

2. **Historical Context**: The Earth formed approximately 4.5 to 5 billion years ago. During the early stages, the atmosphere was reducing, and oxygen was absent. This means that no living organisms existed on the Earth's surface at that time.

3. **Emergence of Oxygen**: Around 3.5 billion years ago, oxygen began to enter the Earth's atmosphere. This change in the atmosphere created conditions that allowed for the emergence of living organisms.

...