Can i get help with this dont really get it

What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

What human activity increases beach erosion?