Questions

Life originated by chemosynthesis was proved in the laboratory by Miller.

You have to consider three things.

1. First, are the bonds polar?

Look at differences in electronegativity and if  it is >0.5, bonds are polar.

2. Second, does the molecule have unshared electron pairs?

If so, they generally lead to a polar molecule.

3. Third, is the molecule symmetric?

If so, then although the bonds may be polar, the symmetry cancels out the individual bond polarity and the molecule is non polar.

CF4 follows all the rules above and has a symmetric distribution of charge, making it nonpolar. The others all have asymmetric charge distributions.

Hence, CF4 represents a Non-polar molecule.

Capital of  Ethipoia is Addis Ababa 

In high plateaus of the Hot  Wet Equatorial Region the temperature is very much lower and so the "Ecuador type' of climate develops typically on the high plateau of Ecuador at an elevation of about 2430 to 3050 meter. Because of the pleasant average temperature of, 13oC. This is described as the "Land of eternal spring".