In which context would an appeal to emotion most likely be used in a letter?

Yes it is , My reason being is because in a letter you would use an appeal to emotion so that the person or people whom you are giving it to will know how you were feeling.

I really hope this helps you out a lot.
 

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.