What connection do all living things have with each other?
a. they breathe air to get oxygen.
b. they use the same set of nucleotides.
c. they use energy from the sun to make food.
d. they have the exact same nucleic acid sequence?

b. they use the same set of nucleotides.

Explanation:

All the organisms use same set of nucleotides to specify an amino acid during translation because genetic code is universal.  Genetic code which is a unit of genetic code is made up of various codons which are in turn a sequence of three nucleotides. Some of the examples of codons are AUG, CCG, UCG etc. Same codon specifies a particular amino acid to be incorporated into a peptide chain in all the organisms. For example, AUC specifies isoleucine in all the organisms of this earth including humans, plants, bacteria etc.

      The right answer to this question is option B. they use the same set of nucleotides.

Explanation:

      It's known that all organisms have the same set of nucleotides, that was discovered just on the last century. Technology took a very long time to develop itself to the point that it could get to this point.

      The set of nucleotides is pretty simple to understand, there are four of them, they are called A,C,G,T, or, Adenine, Thymine, Guanine, and Cytosine.

       This set is used by every single living being on earth to produce their proteins and express their characteristics. But remember, with these nucleotides, there can be created lots of different kinds of proteins, it will always depend on the organism we are talking about.

a.) a destruction fo cells by viral reproduction

i am positive it is c. condensing but i may be wrong