What are the main nitrogen-containing nutrients in the biosphere?.

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

In the controversial scientific process of cloning, organisms are created that are genetically identical to there parent. this process would be classified as

Which base is found only in rna? ribose othymine ouracil o deoxyribose detecteet