Which of the following are chemical reactions? Check all that apply A. Pouring chocolate sauce into milk to make chocolate milk
B. Making caramel sauce
C. Getting a suntan
D. Mixing oil and vinegar to make salad dressing

b and c

Explanation:

In b you'll be mixing and heating up the sauce creating a new compound from  older components and in c, the ultraviolet lights will change your skin cells.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .