Which of the following is not learned from studying fossils?

if an animal ate meat or plants
how species changed in the past
how large extinct animals were, at the time
what types of species will evolve in the future

How large extinct animals were, at the time. 

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