Suppose this branching tree is part of a museum exhibit write an explanation of the branching tree for museum visitors describe the relationships shown on the tree and identify evidence supporting the relationships. me i don't understand

They mean like give the tree a story to tell just make up a story like about how old it is and how maybe there were ancient ppl that carved on it its not that complicated just take ur time and read the question through 

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