Ididn’t know what to say.
i gave her a packet of tomato seeds
and asked her to plant them for me, told her
when the first tomato ripened
she’d miss me.

the narrator assumes that she will

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.