The purines are:

adenine and guanine

cytosine and guanine

cytosine and thymine

ribose and deoxyribose

How do symptoms created by inflammation the doctor

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

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