What were the organisms that among earliest forms of life and able to photosynthesize?

The organisms that were among the earliest forms of life and able to photosynthesize are cyanobacteria.

- These primitive photosynthetic bacteria were some of the first organisms to capture light energy from the Sun and convert it into chemical energy through photosynthesis.

- Cyanobacteria also have a unique pigment called phycocyanin, which gives them their characteristic blue-green color.

- They were likely responsible for producing oxygen in the Earth's atmosphere, creating the conditions necessary for the evolution of more complex life forms.