When was the field of psychology first introduced as its own subject? Who was it introduced by and where was it introduced? What two existing fields is psychology loosely based on?

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .