Cyanobacteria are oxygenic photosynthetic bacteria. They harvest the sun's energy, absorb carbon dioxide, and emit oxygen. Like plants and algae, cyanobacteria contain chlorophyll and convert carbon dioxide to sugar through carbon fixation. Unlike eukaryotic plants and algae, cyanobacteria are prokaryotic organisms.
A decomposer is a hetrotroph i cant explain it though because im horrible at explaining things
A law is something that can be measured or observed to be true. A theory, is something that can be assumed to be true based on the best available knowledge.