In the following conversation, which group discussion technique does han most clearly show?

emily:
han, i got to respectfully disagree with you. history professors wrote both of those books. ramona:
and history professors are reliable sources? emily:
[nodding] well . . yeah!

han:
o. k., normally i would get that. most history professors would be extra careful about using accurate details to make sure their claims are credible. but i did some extra research.

a. evaluating an author's point of view
b. asking clarifying questions
c. determining new research goals
d. challenging prevailing ideas

Option D,  Challenging prevailing ideas

Explanation:

Han is trying to emphasize how his article is written with better literature understanding as compared to the  previous works of  other author.

He is clearly talking about his extra efforts that he has put into the research work which makes his work superior and different from others.

He on the second hand also want other people to understand his point of view  and thus in a way he challenges the previous studies and researches

Hence, option D is correct

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

a compound light microscope is used to magnify objects in steps.  

hope it