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Viruses can enter animal cells by:
Machine Code
The lowest level of software, consisting of binary instructions directly executable by a computer's CPU.
Hydrogen Bond
Weak bond that arises between a slightly positive hydrogen atom of one molecule and a slightly negative atom of another molecule, or between parts of the same molecule.
Water Molecule
A molecule composed of two hydrogen atoms and one oxygen atom, essential for life.
Oxygen Atom
A chemical element with symbol O, essential for cellular respiration in living organisms.
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