How does living six months with 24 hour's of sunlight or darkness affect the human body

you could become ill and die from certain chronic illnesses which would be caused by the lack of sun

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

thats a little if u want the answer just look it up on google thats what i do haha : )