I would have to say A) capsid
Learning about the different body parts will help us better understand human life and health because it can make us care about others instead of just are selves and encourage us to do something about the health difficulties in life.
I think the answer is B..
I believe the answer is quite simple.
She must've compared the clothing washed with the new detergent with the old one. Jenny must've looked for stains, odour, etc. These would help determine whether or not the new detergent worked better.