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Which of the following lack a nucleus and are structurally simple?
Infant
A very young child, especially one newly or recently born, usually considered to be from birth to 1 year old.
Zygote
A cell produced by the union of an ovum and a sperm.
Fetus
A developing human from roughly eight weeks after conception to the moment of birth.
Ovum
An egg, the female gamete or reproductive cell.
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