D I'm not an expert but I would say D
Answer: D
Explanation: As a result of scarce resources, societies must answer three key economic questions: – What goods and services should be produced? – How should these goods and services be produced? – Who consumes these goods and services?
question: Are the leading cause of death for 15- to 20-year-olds are
answer: B. Motor vehicle crashes
explanation: In 2008, 2,739 15- to 20-year- old drivers were killed and an additional 228,000 were injured in motor vehicle crashes. “Motor vehicle crashes are the leading cause of death for 15- to 20- year-olds.” “In 2008, 12 percent of all the drivers involved in fatal crashes were between 15 and 20 years old.”
source: https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/811169
have a great day fam!
No the answer is not A because all your mucus builds up in your respiratory system not respiratory secretion. <span />
Muscular and nervous system
Muscles receive messages carried by nerves and contract, resulting in movement