Which of the following is a physical property of a substance? A. Toxicity
B. Flammability
C. Reactivity
D. Hardness

I'm pretty sure it is Hardness

Explanation:

It is the only thing that you personally can tell by using one of your five senses. Physical properties can only be told by the look or feel of the object. Sorry if i'm wrong

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

did anyone actually do this? like if anyone has submitted this i rly need .