During the early 1960s, many senior citizens faced the challenges of A. poverty and a lack of health insurance.
B. poverty and a lack of education.
C. technological changes and a lack of education.
D. technological changes and voting restrictions.

b or c ( this is because my answer is short so just ignore it)

logging hope this

incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth

i think 3 documents.

hope i

-lavira: )