Which is the endpoint of a ray?
O point R
O points
Opoint T
W
O point U

Ibelieve it is the 2nd answer, create gardens on all rooftops. let me know if this .

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 after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;