Here’s what he’d do: first, he’d buy a bag of plain M&Ms, and take out two at random. Next, he’d hold them lying flat, one on top of the other, between his thumb and index finger, and gently squeeze them together. Whichever one started to crack first lost the survival test, and the winner moved on to the next round.
He’d go through the entire bag this way, squeezing two M&Ms together, setting aside the winner and eating the loser. After all the rounds, he would be left with one M&M that never cracked.
He would then mail this one back to the M&M Mars, with a letter explaining that it was a champion and should be used “for breeding purposes.”