Choose the correct process for the description given: does not require light

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

Are the layers of rock above and below the coal older or younger?

Aragonite shells of clams, snails, or scleractinian corals may be preserved unaltered in cenozoic deposits, but they are generally dissolved or recrystallized in older deposits. true or false