OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the species disappearing from the fossil record
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scientists having not seen the species in at least twenty years
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the species having never been discovered in fossils found in its habitat
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the species having been placed on the endangered species list and later removed from that list
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Detailed explanation-1: -Mass extinctions were first identified by the obvious traces they left in the fossil record. In the strata corresponding to these time periods, the lower, older rock layer contains a great diversity of fossil life forms, while the younger layer immediately above is depauperate in comparison.
Detailed explanation-2: -Marine fossils are mostly used to measure extinction rates because of their superior fossil record and stratigraphic range compared to land animals.
Detailed explanation-3: -Fossils. Fossils document the existence of now-extinct past species that are related to present-day species.
Detailed explanation-4: -The extinction of species (and larger groups) is closely tied to the process of natural selection and is thus a major component of progressive evolution. In some passages of the Origin, Darwin seems to have seen extinction as part of natural selection; in others, as an inevitable outcome.