Question

Cyanobacteria are

are eukaryotes and the earliest type of algae

Oa.
are chemoautotrophs
b.
photosynthetic bacteria
O
are the only prokaryotes that can use photosynthesis
O
not an important part of the carbon cycle
O

Answer 1

Photosynthetic bacteria.

Step-by-step explanation:

Cyanobacteria also called Photophyta are photosynthetic bacteria even some are nitrogen-fixing bacteria. Cyanobacteria have internal membranes. These are flattened sacs called thylakoids where photosynthesis is performed.