Group 2, I reckon. They started off with 100 mL vegetable oil, and group 2 ended up with 10+ of that, they also had an increase in engine oil. It was supposed to decrease like all of the other groups, but instead it increased like none of the groups.
B. mammary glands and hair or fur. things also to classify: feed milk to young, give birth live, and breathe in air, so they have lungs.
The answer is
C. The way the layer interacts with the layer below it.
