An example of body language is frowning when you disagree with someone. accidentally bumping into someone on a crowded street. indigestion after eating too much. sweating after a workout.

Frowning when you disagree with someone.

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.