Emma bends and straightens her arms while lifting weights. Which body systems work together to make this happen? a
Nervous and skeletal

b
Muscular and endocrine

c
Skeletal and muscular

d
Nervous and endocrine

3. draw a topographic map that displays the following features: (4 points each) a. the contour interval is 20 meters. b. the point of lowest elevation is 960 meters. c. the point of highest elevation is 990meters. d. there is at least one sinkhole or depression, at any elevation. e. there is at least one steep slope and one gentle slope.