What grows inside the structure pictured below?

Where’s the structure??

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for

Only algae, oak trees, and bermuda grass produce atp by photosynthesis i am almost positive