Examlex
Which of the following groups of vertebrae are closest to the head?
Molecular Clocks
Methods used to estimate the time of evolutionary events based on the hypothesis that genetic mutations accumulate at a predictable rate over time.
Fishlike Vertebrates
Aquatic animals featuring a backbone, including both true fish and fish-shaped species with similar living habitats and structures.
Million Years
A time unit used in geology and astronomy to describe extremely long periods, typically used in the context of the age of the earth or the distance of cosmological objects.
Population
Members of a species that reside and reproduce with each other in a particular location.
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