Heredity is defined as
A.
the ability to reproduce within an organism.
B.
the passage of genetic instructions from one generation to the next generation.
C.
the adaptations of an organism to its environment.
D.
the process of species becoming more complex over many generations.

B.

the passage of genetic instructions from one generation to the next generation.

These are called genes. One mate reporduces with another made and the genetic buildup merges 50 % and 50% with genetics(if it's meiosis), or DNA codes from the parents to the offspring that then possess some of the genes. That shows heridity.

c. electrical charges of ionic bonds.