Which of the following is favorable to the camel?
stony soil
increasing humanity
the tsetse fly
sandy soil

I believe the answer to be D. Sandy Soil, because of the fact that their toes provide excellent grip for a sandy soil region! 

Hope this helps you!

It's probably because some types of violets are blue

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