5. Tom: "I am writing a letter". report the given sentence A. Tom said (that) i am writing a letter.
B Tom said that he is writing a letter.
C. Tom said that she has been writing a letter.
DTom said (that) he was writing a letter.

I’m not sure about this but i think that it’s c

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.

Oofuv