Examlex
Epithelium is anchored to adjacent tissues by this thin,nonliving layer.
Neutrons
Subatomic particles, found in the nucleus of an atom, that have no electrical charge and a mass slightly larger than that of protons.
Element
A substance that cannot be broken down into simpler substances by chemical means and is made up of atoms all with the same number of protons.
Isotope
Variants of a particular chemical element which differ in neutron number, and consequently in mass, but not in electrical charge.
Sr
Strontium, a chemical element with symbol Sr and atomic number 38, known for its bright-red flames in fireworks.
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