Crossword puzzle clue "population study pioneer"

Here are the possible solutions for population study pioneer clue

Answer
Clue
Relevancy
malthus
Clue
Population-study pioneer
cram
Clue
Study, study, study
Definition
to pack tightly
nerds
Clue
"Study, study, study" types
Definition
NERD, a person obsessed with computers at the expense of human interaction, also NURD
aboutonebillion
Clue
China's population
afr
Clue
Roughly 15% of the Earth's population: Abbr.
It's roughly 15% of the world's population: Abbr.
It's home to roughly 16% of the Earth's population: Abbr.
It's home to roughly 15% of the world's population: Abbr.

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