According to the endosymbiosis theory, scientists believe that early eukaryotes formed from prokaryotes. Why do scientists believe that prokaryotes existed earlier than eukaryotes?
A.
All prokaryotes are aquatic in nature.
B.
All prokaryotes perform photosynthesis.
C.
Prokaryotes have organelles, while eukaryotes do not.
D.
Certain eukaryote cell structures resemble prokaryotes.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )