Identify the following piece of lab equipment.

a). florence flask
b). garduated cylinder
c). erlenmeyer flask
d). volumetric flask
e). beaker

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