He could see the river like the silver track / left by a snail, roads as narrow as ribbons .
which identifies the type of figurative language that is used twice in these lines ?
a . simile
b . exaggeration
c . personification
d . irony

 A  simile  i hope this help                                                  

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.