Adifferentiation between two similar stimuli when only one of them is consistently associated with the us is called _

The answer is "Stimulus Discrimination".
“us” in the above question stands for  unconditioned stimulus. Discrimination is a term utilized as a part of both operant and classical conditioning. It includes the capacity to recognize between one stimulus and similar stimuli. In the two cases, it implies just reacting to specific stimuli yet not to those that are similar.

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.