Examlex
Fossil evidence of animal life dates back __________ years.
Expensive
High in price or requiring a significant amount of money to purchase.
Research
The systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.
Self-actualization
The achievement of one's abilities and possibilities, seen as a natural desire or motivation in all people.
Physiological
Relating to the branch of biology that deals with the normal functions of living organisms and their parts.
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