Examlex
Based on the results from phylogenetic studies of HIV (and assuming a molecular clock) , it has been determined that HIV entered the human population _______ years before it became a global pandemic.
Cephalocaudal
From head to tail.
Proximodistal
From the inner part (or axis) of the body outward.
Growth Spurt
A period during which growth advances at a dramatically rapid rate compared with other periods.
Fourth
The ordinal number following the third, indicating the sequence of an item in a list.
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