The structure labeled X in the picture represents a building block of DNA (monomer). This structure is known as:
X
A
TA
Figure 1
o
protein
an amino acid
a nucleotide
RNA

the man is bald so he has no hair to get wet

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.