Plasma, water, salt, protein, platelets
I believe the answer is a) the scientific method involves developing and testing questions
Number 6 is c. number 7 is a. and i'm not sure
of number 8 sorry
The best answer to the question above would be letter d. The sentence presented which is 'Researchers helped further the biological perspective when they demonstrated that electrical stimulation of the brain could evoke emotional responses in animals.' demonstrates how new discoveries can influence perspectives.