Once photosynthesis evolved oxygen started to be released to Earth's atmosphere. why did it 1 point take a long time for oxygen to start to build up in the air?
A)because all the living organisms breathed it up
B)because the rain would wash it away
C)it was soaked up by ice
D)It was soaked up by the iron in rocks and iron in the ocean

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

Dna has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. one aspect of dna that allows it to accurately store genetic information is the base pairing from chargaff\'s first rule of the four nucleotide bases. if the c content of a dna molecule is 22%, what are the percentages of the remaining bases?

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a.coral reefs because of the loss of the symbiotic algae living within their bodies b.penguin populations because the fish they eat will move into warmer waters c.mountain-dwelling birds because rising sea levels will relocate their food sources d.large cats in the rainforest because of decreased habitat loss for their prey