"9.8 years" is the correct answer!
I believe the answer is: increase in food supply and disease immunity.
Prior to 2000 years ago, society experience massive shortage in food supply which cause a lot of people died due to hunger which always keep the population low.
The fact that there is no vaccine also contribute to the low population because it cause a lot of death for infants and children before they grow up.
c. has two houses.
b. is one-chambered.
d. is half Republican and half Democrat.
The Patriot Act helps protect potential terrorists from unfair government searches and seizures by increasing the power of the U.S. Constitution.
The Patriot Act adds several new amendments to the U.S. Constitution to help protect the world against the spread of terror.
The Patriot Act reinforces and protects the rights and freedoms established in the U.S. Constitution.
Answer:
A
Explanation: