Select the 2 correct statements that describe cyanobacteria.(1 point) Responses Cyanobacteria lived in the ocean Cyanobacteria lived in the ocean Cyanobacteria were the first photosynthesizing organisms Cyanobacteria were the first photosynthesizing organisms Cyanobacteria have complex cells containing a nucleus Cyanobacteria have complex cells containing a nucleus 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.

Cyanobacteria are known for being some of the earliest organisms to perform photosynthesis, which contributed significantly to the oxygenation of Earth's atmosphere. They primarily inhabit aquatic environments, including oceans. Cyanobacteria are prokaryotic organisms and do not have complex cells containing a nucleus. They actually increased, not decreased, the levels of oxygen in the atmosphere through their photosynthetic activity.