Shaky already covered the laws of motion....which apply to forces...
LOLOf course there are "Polar opposites".........And even with Asexual organisms............there IS STILL AN OPPOSITE within there/that body.
What the hell...There is "Cause and Effect"..............These are opposites.............It's in science.........it's in frickin everything........cycles...............
*Goes to Walmart*
cause and affect are not oposites. I strike a match (cause).....the friction causes the match head to catch fire (affect). A match head catching fire is not the opposite of a match being struck.