In the eon prokaryotes still dominated the worlds living things paleozoic proterozoic phanerozoic none of the above

The correct answer is none of the above.  

It is in the Archean Eon that the prokaryotes dominated the world's living things. It is earlier of the two formal divisions of Precambrian time, that is, about 4.6 billion to 541 million years ago, and the period when the life initiated on Earth.  

The Archean Eon started about 4 billion years ago with the creation of Earth's crust and prolonged till the beginning of the Proterozoic Eon. The fossil proof of the primitive life forms, that is, prokaryotic microbes from the domain Archaea and bacteria appeared during this time.  

During the Archean Eon, life initiated and was subjugated by the one-celled prokaryotic life forms.  

the answer is c) an oak tree

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.