Answer:
Henslow organised his herbarium to emphasize variation within species and determine the limits between species. He was a religious man who believed the orthodoxy of the day that species were stable and did not evolve. ... When Darwin took his famous trip on the HMS Beagle in 1831, his place was arranged by Henslow
An established population that is accustomed to change.
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the age of Rock in years is called its absolute age geologist find absolute age by measuring the amount of certain radioactive elements in the rock