Which of the following is not part of the structure of a nucleotide? a. amino acid b. phosphate group c. sugar d. nitrogen base

Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting

Match with o for organic and i for inorganic for each compound

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures