Lipids, proteins, polysaccharides, and nucleic acids are large polymers that make up the different components of our bodies. Which element can be found as the backbone of all of these macromolecules? Phosphorus
Oxygen
Nitrogen
Carbon

Answers to mastering biology drag the labels to their appropriate locations to complete the punnett squares for morgan's reciprocal cross. drag blue labels onto the blue targets to indicate the genotypes of the parents and offspring. drag pink labels onto the pink targets to indicate the genetic makeup of the gametes (sperm and egg). labels can be used once, more than once, or not at all. hints