Which is true about scientific theories?

a: they are the result of a single experiment.
b: they are the results of many experiments over a long period of time.
c: they are proposed by scientists who wish to investigate a new topic.
d: they are only based on the most recent evidence.

they are results of many experiments over a long period of time

answer: cesare beccaria developed the classical school of criminology with from philosopher jeremy bentham

explanation:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).