What evolutionary trade-off appears to be represented by the boxfish pairing its awkward body shape with a chemical deterrent?

Answer

Mobility for armor

The text suggests that having sacrificed mobility for physical armor, the boxfish must rely on poison when that armor is compromised or when it is forcibly moved.

What evolutionary trade-off appears to be represented by the boxfish pairing its awkward body shape with a chemical deterrent?
animaltouchfishBoxfish