Label the sequence of events in the evolution of the atmosphere in the correct order.
the atmosphere is thin. earth is hot due to meteorite bombardment.
eukaryotes began to form.
earth cools. water vapor condenses and oceans form.
photosynthesis by cyanobacteria reduces the level of carbon dioxide in the air. banded iron formations form in the oceans.
a thick atmosphere develops due to volcanic outgassing, shielding the surface from meteorite bombardment.
oxygen moves from the oceans to the atmosphere.
cyanobacteria evolve in the oceans and produce oxygen.
Answers: 3
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Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers
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Label the sequence of events in the evolution of the atmosphere in the correct order.
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