Question and answer
Biologists estimate how long ago species separated from a common ancestor using a technique called _____. a molecular clock radiometric dating relative dating stratigraphy
They use a molecular clock.
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Original conversation
User: Biologists estimate how long ago species separated from a common ancestor using a technique called _____. a molecular clock radiometric dating relative dating stratigraphy

Weegy: They use a molecular clock.
aaaaaaaaaaaaaaa|Points 3996|

User: _____ created oxygen in the early atmosphere. Photosynthetic bacteria Asteroids hitting the earth Plankton Volcanic eruptions Forests

User: The Cretaceous-Tertiary extinction, the most famous of all the Big Five, has been attributed to what major event that triggered the fall of the dinosaurs? an asteroid hitting the earth increased competition from mammals rapid growth of forests on land surfaces glaciation

Weegy: Two prominent theories of extinction are climate change and an asteroid hitting the Earth.
diharpie|Points 2760|

User: Ninety-five percent of all living organisms were killed by the deadliest mass extinction in history. It is known as the _____ mass extinction. Cretaceous-Tertiary End Triassic Permian-Triassic Late Devonian Ordovician-Silurian

Weegy: Ordovician-Silurian, have another question?
ANGEEELICA|Points 7867|

User: When huge numbers of species die out in a short period of time, it's known as a mass extinction. True False

User: The first life forms found on Earth were _____. bryozoans bacteria insects shellfish

Weegy: The first life forms found on Earth were bacteriA
Expert answered|jeifunk|Points 1780|

User: A geologist is studying layers of rock. He finds a fossil of a bony fish. According to the law of faunal and floral succession, what new type of fossil would he most likely find next, in the layers of rock above? a fossil of an amphibian a fossil of a reptile a fossil of a trylobite a fossil of a human

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Asked 3/26/2012 8:37:30 PM
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