The nutrient that is part of carbohydrates, proteins, and nucleic acids, and that forms biomolecules, is
nitrogen
carbon
magnesium
iron

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.

there's the proffessional site that will you.