Compare the living conditions and the structure of green brown and red algae.

green, brown and red algae are lower plants.
green algae contain plates of chloroplasts. multicellular green algae live in the upper layers of water bodies.
brown algae live in the seas and inhabit the middle layers of water bodies. the almost complete absence of chlorophyll makes brown algae independent of the process of photosynthesis. That is why their habitat is the seabed.
Red algae are a group of algae that contain the red pigment phycoerythrin in their body.
Red algae live mainly in the seas. Despite the small amount of chlorophyll, these plants carry out photosynthesis.