Biology, 20.08.2019 19:40 SoWhat2237
What caused the amount of oxygen in the atmosphere to stabilize to the extent that it is today? a. oxygen was toxic to many of the organisms living at the time. b. carbon dioxide dissolved into the oceans, eventually forming carbonate rocks. c. carbon dioxide dissolved into the oceans and was eventually used in the formation of sea creatures' shells. d. the amount of oxygen consumed by respiratory organisms balanced the amount of oxygen produced by plants undergoing photosynthesis.
Answers: 2
Biology, 21.06.2019 18:30
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.
Answers: 2
Biology, 22.06.2019 01:30
What type of competition exsist between two species. turtles and fish
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Biology, 22.06.2019 09:00
Which two criteria must be met before scientist can use radiocarbon dating? explain your answer
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What caused the amount of oxygen in the atmosphere to stabilize to the extent that it is today? a....
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