National parks reduce the human impact on land by preventing human development.
The answer is source B because it has a listed author who is an expert and it is the governments organization website which are more reliable that a .com website. Source A does not even list the author so you do not know who wrote it could be anyone.
I think the answer to this question is headache. <span />
Before modern medicine, in which treatment's with certain ethical therapies and medication, most patients with mental illness where placed in institutions no matter how severe, and were forced to go through unethical therapies such as electroshock or lobotomies.
Answer:
Stress occurs when the body physically sustains grave injury due to environmental factors.
