Examlex
Natural selection is a key supporting principle of ____ theory.
Prokaryotes
Single-celled organisms without a nucleus, including bacteria and archaea, characterized by the absence of membrane-bound organelles.
Element
A substance consisting of atoms with the same number of protons in their nuclei, representing the simplest form of chemical substances.
Isotopes
Variants of a particular chemical element that have the same number of protons but different numbers of neutrons in their nuclei.
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