im in 9th grade geography at keystone online school and i need to turn in the projects for the whole class by 12 tonight does anyone have any of the projects anything helps

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

Answer (d) the greenhouse effect is primarily caused by car and trucks;