Newton's third law of motion is also known as the LAW OF ACTION-REACTION. Newton's third law says that every time there is an action force, there is also a reaction force that is equal in size and acts in the opposite direction. Newton's third law states that force must ALWAYS occur in pairs.
Listed below are the REACTION forces for the ACTION forces provided:
A. Your bottom pushing on your desk seat
REACTION: The desk seat pushing up on your bottom.
B. A bat hitting a baseball
REACTION: The baseball pushing back on the bat.
C. Your finger pressing on your phone screen while texting
REACTION: The phone screen pushing back on your finger.