Odyssey awhich of the following occurs during photosynthesis? o a) co2 is used to produce watero b) co2 is absorbed by mitochondriao d) co2 and h20 are combined into carbonic acidheli

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation