Examlex
The construction of a phylogeny from DNA sequence data requires:
Atomic Number
The number of protons found in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Hydrogen
The lightest and most abundant chemical element in the universe, consisting of just one proton and often one electron.
Neutrons
Subatomic particles found in the nucleus of an atom, with no electrical charge and a mass slightly greater than that of protons.
Protons
Positively charged subatomic particles found in the nuclei of atoms which determine the element's identity and properties.
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