What are valence electrons? A. the atomic mass

B. the atomic number

C. all of the electrons in an atom

D. electrons in the outermost energy level

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

What is used to keep track of the gamates and possible offsprings combination