Active and passive transport :) hope that helped
Antagonism is the process by which two hormones exert opposite effects.
It is zero and that is simply because that is how additive opposites are defined.
1. The most exciting attractions are between two opposites that never met. 2. All colors are the friends of their neighbours and the lovers of their opposites. 3. Force and mind are opposites; morality ends were a gin begins. 4. Most people think that success and failure are opposites, but they both are products of the same process. 5. I'm smart, your not. I'm tall, your not. We're different in many ways, but somehow we're still friends.
Binary opposites are a pair of related terms or concepts that are opposite in meaning. Binary opposites are two opposite modes, like on or off, left or right.
few, scarce
maybe...
opposite of light
potato fart
Zero
Polar opposites are individuals or concepts that present contradictory or conflicting approaches to a theory or plan. A similar term is diametrical opposites, being at two extremes or contrary positions.
If you mean the word itself, your question is an example. If you mean two opposite things, then "up and down are opposites"
Because by definition, there sum will always be zero. Because the definition of opposites are additive inverses.