1.Which is not part of the digestive system?
A.kidney
B.esophagus
C.intestines
D.stomach
2.Which gas is released by humans during respiration?
A.Carbon Nitride
B.Carbon Dioxide
C.Carbon Trioxide
D.Carbon Monoxide
3.Ehich of the following is not level of biological organization?
A.organism
B.abiotic
C.organ
D.cell​