What largest organ can cause sickness? 
Heart lungs immune germs mold Skin Liver Stomach
A B C D E F G H
An apathetic frog is probably a sick frog.
Sickness can be caused by skin breathing problems.
What largest organ can cause sickness?  (A) Heart (B) lungs (C) immune (D) germs (E) mold (F) Skin (G) Liver (H) Stomach