Examlex
In the resonance form of ozone shown below, the formal charge on the central oxygen atom is __________.
Embryo
The early stage of development in multicellular organisms after fertilization and before becoming a fetus, characterized by rapid cell division and differentiation.
Fetus
A developing mammal or human after the embryonic stage and before birth.
Syphilis
A sexually transmitted bacterial infection that can cause serious health problems if not treated.
Down's Syndrome
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by distinctive physical features and developmental delays.
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