Examlex
Due to the extremely rapid orbital velocities of material near the center of many galaxies, these galaxies are believed to contain _______________ at their centers.
Alpha Particle
A type of radioactive emission consisting of two protons and two neutrons, equivalent to a helium nucleus.
Beta Particle
A beta particle is a high-energy, high-speed electron or positron emitted by certain types of radioactive nuclei during radioactive decay.
Cytotoxic
Refers to substances or cells that are toxic or destructive to living cells.
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