Answer the following question given this paragraph: 

The first photosynthetic organisms were bacteria that lived in the water. So, where did plants come from? Evidence shows that plants evolved from freshwater green algae, a protist ( Figure below ). The similarities between green algae and plants is one piece of evidence. They both have cellulose in their cell walls, and they share many of the same chemicals that give them color. So what separates green algae from green plants?.


Q: The first photosynthetic organisms were not plants, but types of what that lived in the water?

 Choices:

- pathogens

- fungi

- algae

- bacteria

A:
bacteria
