<span>DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.</span>
Near-Ultraviolet, Violet, blue, green, and yellow
<span>behavioral teratogens.
Behavioral teratogens tend to harm the prenatal brain, affecting the future child's intellectual and emotional function. Behavioral teratogens can include: Viruses, drugs, chemicals, environmental stressors, and malnutrition.</span>
