A change in position over time is called a shift.
So In biology, a mutation is an alteration in the nucleotide sequence of the genome of an organism. So what would you look up that interests you
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Atoms are the smallest unit.
Anatomy. study of structures.
bacteriology. study of bacteria.
botany. study of plants.
cytology. study of cells.
ecology. study of the environment.
embriology. study of developing organisms.
Neutrons are the subatomic particles that are stored in the core of an atom with the protons. An atom is mostly empty space. At its center is a nucleus made up of particles made up of particles with a positive electric charge called protons and electrically neutral neutrons.
Isotopes is a word that gets thrown around in chemistry very often. Isotopes are different versions of an element or different versions of a certain kind of atom. Isotopes deal with atoms having different numbers of neutrons but the element will be the same but one may be heavier or lighter than another.