The first appearance of life was in the eon.

archean

phanerozoic

proterozoic

none of the above

i am going to guess that it is co2.

b.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )