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also known as blue-green algae, started out on Earth quite a while ago.

he tried to prove the theory of spontaneous generation

suggested that microorganisms from the air probably entered needham's solutions after they were boiled

living cells arise only from preexisting living cells

– RNA that carries out enzyme-like functions

t, Pangaea split into northern and southern land masses, which we call

about 66 million years ago, the world again lost an enormous number of species. •At that point, dinosaurs had dominated the land and pterosaurs had ruled the air for some 150 million years. •After the Cretaceous mass extinction, the pterosaurs and almost all the dinosaurs were gone, leaving behind only the descendants of one lineage, the birds.

– includes taxonomy; a discipline in biology that focuses on classifying organisms and determining their evolutionary relationships

are periods of evolutionary change in which many new species evolve from a common ancestor, often following the colonization of new, unexploited areas.

– the evolutionary history of a species or group of species