Read of following statements and find out the incorrect statement(s).
a. Genetics deals with the inheritance, as well as variation of characters from parents to offspring.
b. Variation is the process by which characters are passed on from parent to progeny.
c. Inheritance is the basis of heredity.
d. Inheritance is the degree by which progeny differ from their parents.
e. Human knew from as early as 8000-10000 B.C. that one of the causes of variation was hidden in sexual reproduction