Suppose in one experiment in a series you found no difference in your participants' responses to the levels of your independent variable. You suspect that the levels you chose were too close together. So you redo the experiment with appropriate levels. It would be ethical to

leave the first experiment

Explanation:

In simple words, if the experiment that is done earlier have resulted in no conclusion and the researcher is using new variables then he or she should leave the prior experiment and should not include any data or micro conclusions from it.

Adding it to the report would result in incorrect conclusions that can hinder or deviate the studies that might be performed from the experiment in the future.

the answer would be in this answer. someone already asked the question.  

it depends on which society you are referring to. many civilization performed rituals so the gods would with their growing season but the most well known is that of the aztecs. they would make sacrifices, usually animals, but sometimes humans as well.