Which climate is characterized by hot, dry days with cooler night temperatures

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

What would happen if the krill were removed from the food web

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