You push on a tree with 20 N of force. If the tree doesn't move, the tree is pushing back on you with of force.

according to the newton's third law of motion every action has a equal and opposite reaction.

so the answer would be reaction

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The vernal equinox occurs on March 20 or March 21 each year and signals the start of spring in the Northern Hemisphere (and fall in the Southern Hemisphere). The Earth tilts at an angle of 23.5 degrees on its axis relative to its plane of orbit around the sun. My source is history.com A, i think

Explanation:

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