What is one challenge posed by copulation between males and females, and how have grasshoppers adapted to these challenges?

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

in addition to spreading humanist ideas, erasmus has contributed to criticism of corruption in the church.