If 3x−y=12, what is the value of 8x/2y

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.

What is it called when someone gets sick from eating food contaminated with germs or toxins? a. potentially hazardous food b. ptomaine poisoning c. foodborne illness d. raw food

What did pavlov initially notice about the animals in his original research after conditioning took place?