The kidneys, skin, and lungs are each a part of the system.

1. Respiratory
2. Excretory
3. Digestive
4. Nervous

C

Explanation:

There's none really.

Excretory Organs

Organs of excretion include the skin , liver , large intestine , lungs , and kidneys (see Figure 16.2. 2). Together, these organs make up the excretory system .

answer; i believe the correct answer is (replication is not conservative);