Answer:
Economic activity is the activity of making, providing, purchasing, or selling goods or services.
D.) Vertical relationships involve unequal status, while horizontal relationships represent equal status.
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Friction is a force that oppose other forces and can slow them down
Stars form from an accumulation of gas and dust, which collapses due to gravity and starts to form stars. The process of star formation takes around a million years from the time the initial gas cloud starts to collapse until the star is created and shines like the sun
