This type of economy is often found in communist or socialist sytems

a} command economy
b} traditional economy
c} market economy
d} restricted economy

The sun's parallax would be 180 degrees, greater than which you can't get.  so a. would be your anwser 

Ithink it is space that makes up 70 percent

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

Did you know it's illegal to own only one guinea pig in switzerland?   : )