Question

1. since the ______ century, there have been dramatic improvements in the health and life expectancy of americans.

options: 19th, 20th, 21st, 17th, 18th

1. improvements in health and longevity since the 18th century are due largely to all of the following except:

options: genetic testing, improved nutrition, immunization, increase in income, control of pollution

Explanation:

Question 1

To determine the correct century for dramatic health and life expectancy improvements in Americans, we analyze historical context. The 19th century saw advancements in public health, medicine, and living conditions that began to significantly impact health. Later centuries built on this, but the 19th century marked the start of major improvements. The 17th and 18th centuries had less advanced medical and public health infrastructure, and the 20th/21st built on 19th - century foundations. So the 19th century is the answer.

We evaluate each option. Improved nutrition (better diet supports health), immunization (prevents diseases), increase in income (allows better access to resources), and control of pollution (reduces health risks) are factors that improved health since the 18th century. Genetic testing is a relatively modern (late 20th/21st century) technology and not a factor since the 18th century.

Answer:

19th

Question 2