D. 7 4. Which of the following occurs in a covalent bond?
A Two atoms share protons.
B. Two atoms share electrons.
C. Similarly charged ions attract.
D. Oppositely charged ions attract.

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:

it's all four options.

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air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest