What is the main use of technology?
a. to give scientists new ideas
b. to get the government to pass laws
c. to provide solutions to problems
d. to convince the public of a policy

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere, b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify, d)anaerobic bacteria kept thriving with more oxygen