B. Gradualism
"Gradualism is an evolutionary model that refers to the tiny variations in an organism or in society that happen over time to make a better fit for animals and humans in their environment. These variations allow them to survive and thrive, resulting in the slow and consistent process of change in the whole population."
Answer:
the ability to form stable bonds
Answer: "Washing Machine, and ceiling fan"
Reason of explaining: I just took the quiz, and got a 100%!
I think it is D. The National Institutes of Health found it effective in reducing pain and other symptoms, but it is not clear how it works.