Question

Select the 2 correct statements that describe cyanobacteria.(1 point)
Responses

Cyanobacteria were the first photosynthesizing organisms
Cyanobacteria were the first photosynthesizing organisms

Cyanobacteria lived in the ocean
Cyanobacteria lived in the ocean

Cyanobacteria have complex cells containing a nucleus
Cyanobacteria have complex cells containing a nucleus

Cyanobacteria decreased the levels of oxygen in the atmosphere
Cyanobacteria decreased the levels of oxygen in the atmosphere

Answer 1

The two correct statements that describe cyanobacteria are:

1. **Cyanobacteria were the first photosynthesizing organisms.**
2. **Cyanobacteria lived in the ocean.**

The other statements are incorrect because cyanobacteria do not have complex cells containing a nucleus (they are prokaryotic) and they actually increased the levels of oxygen in the atmosphere through photosynthesis.