He was a stupid sonofabitch who didn't scree the concrete enough, his corner post was an eighth of an inch out of plumb, and what asshole set these louvers upside down?

They've already sorted out the students in group A, so we just need to worry about groups B and C.

junk fish

Mutations are mostly deletorious and recessive and carried by heterozygous individuals. So most of them are of no practical value since mutants are unable to compete with the wild type.