Question

Crayfish are small animals that may live in lakes.
(LOOK AT THE ATTACHED PHOTO)

Answer 1

Explanation:

CaCO3 + 2HCl ---------> CaCl2 + CO2 + H2O

As you can see in this reaction, if Crayfish is put in acidification lakes, they will eventually die by btoducing calcium carbonate, Hydrogen and Carbon Dioxide from the shells.

Hope it helps :)