Preliminary, non-experimental, research that gathers information about behavior is called 
research.
Answer:
true
Explanation:
hypertension is high blood pressure
atherosclerosis is hardening on the blood vessel(s)
I believe it would be C. Cracking a rib.
Because
- CPR doesn't involve the arms
- Headaches can happen at any age
- Not finding a pulse can happen with any person
- Cracking a rib would make the most sense to me due to that bone mass or density decreases as a person ages, the bones lose calcium and minerals causing them to deteriorate and become more brittle, which may result in them becoming easily breakable.
This is only my guess though, so don't take my word for it.
Hope it helps at least a little. (:
Waste disposal, food source, medicines, medicinal therapies, and aquaculture are all ways that humans impact the marine environment, humans utilize marine resources, and how marine environments have impacted humans. Our waste disposal hurts marine life. Many times, fish and other marine life gets tangled in human waste and dies. The beaches are full of garbage that is just thrown away. We use items and animals from the ocean for medicines and other items that are needed for human use. The correct answer is D, all of the above.
