Which of the following is a reason why a scientist might do research?
A. to cite their sources
B. to paraphrase material
C. to avoid copying from another source
D. to help them design a good procedure

D.

Explanation:

It helps scientists to do research because they need to hear other peoples beliefs and opinions on the subject they're working on

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).