An organic sample of matter is analyzed by a scientist. The scientist finds that the sample contains a significant concentration of Nitrogen atoms. Based on his findings the scientist should identify the substance as a:

Modern whales developed their traits through natural selection what occurs during the process of natural selection

The united states uses which source of energy to produce almost 40 percent of its electricity

What is the purpose of transcription? a. to copy the nucleotide in dna b. to form rna molecules from dna c. to produce a nucleic acid sequence from an amino acid sequence d. to link amino acids together to form stands of protein