What are the 4 nucleotides found in DNA?

Science question here.

They are described here, with pictures:

http://www.blc.arizona.edu/Molecular_Graphics/DNA_Structure/DNA_Tutorial.HTML

The four nucleotides found in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T).

To determine this, you can refer to the structure and composition of DNA. DNA consists of two strands that are made up of nucleotides. Each nucleotide contains a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base.

The four different nitrogenous bases in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T). Adenine pairs with thymine, and guanine pairs with cytosine, forming the double helix structure of DNA.

Scientists have made these observations through various experiments and studies, primarily using techniques like X-ray crystallography and base-pairing experiments. So, the knowledge about the four nucleotides in DNA is based on years of scientific research and analysis.