How much of earths atmosphere is made up of nitrogen and oxygen ? A. Less than 1 percent B. close to 99 percent C. 50 percent D. Between 24 and 75 percent

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

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

(amoeba sisters video recap: pedigrees and need