Examlex
The cost of entitlement programs such as Social Security and Medicare is declining steadily.
Burgess Shale
A famous fossil field located in the Canadian Rockies of British Columbia, known for the exceptional preservation of the soft parts of its fossils from the Cambrian Period.
Cambrian Period
A geologic era approximately 541 million years ago, marked by a rapid increase in the diversity of life and the appearance of most major animal groups.
Evolution
The way in which a range of living beings is believed to have originated and diversified from former types during the chronological history of the earth.
Evolutionary Diversification
The process by which a single ancestral species evolves into a wide variety of descendant species differing in morphology, behavior, and ecological niches.
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