What is another element in the same chemical family as oxygen

In the african savanna,more wildebeests are born than the environment can support. which is most likely to happen over a period of years as a result

What prevents odyssey from killing the sleeping cyclops

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