Natural selection leads to __________: traits that enhance an organism’s chances of survival and reproduction.  

Which interaction between atoms is the strongest?

The attraction between a water molecule and a different substance is known as:

Which of the following is NOT a common feature life forms share?  

In RNA, the base uracil replaces 

Refer to the diagram below showing a condensation reaction (also known as dehydration synthesis).   This reaction does not occur during the formation of a(n):

Hydrogen bonds differ from covalent bonds in that

The two covalent bonds in a water molecule are polar because

Which characteristic of water prevents lakes, ponds and oceans from freezing solid in the winter so that life can survive in water?  

Water is a very versatile solvent because water molecules are _____.