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Biologists estimate how long ago species separated from a common ancestor using a technique called
Cladograms
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User: Biologists estimate how long ago species separated from a common ancestor using a technique called

Weegy: Cladograms
IfNotSo|Points 7291|

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





Weegy: Asteroids hitting the earth created oxygen in the early atmosphere.
Expert answered|paral|Points 2202|

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

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Asked 9/21/2012 10:43:50 AM
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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: Permian-Triassic User: Scientists think the earth is approximately how old? User: The first life forms found on Earth were _____ User: bryozoans bacteria insects shellfish User: The first life forms found on Earth were _____. bryozoans bacteria insects shellfish Weegy: bacteria (More)
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Asked 9/21/2012 10:59:26 AM
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The internal structure of the earth consists of three main layers. Starting from the center of the earth and moving outward, they are _____. the core, mantle, and crust the core, magma, and crust the crust, mantle, and core the mantle, core, and crust User: The internal structure of the earth consists of three main layers. Starting from the center of the earth and moving outward, they are _____. A the core, mantle, and crust B the core, magma, and crust C the crust, mantle, and core D the ...
Weegy: a deer dying and decomposing User: Fossils, like the Mesosaurus found on both Africa and South America and the Glossopteris plant found on several continents, helped to support the _____. dinosaur era continental drift theory Wegener theory plate tectonic theory Weegy: continental drift theory User: Which of the following are geochemical cycles important for recycling and balancing earth materials? carbon and nitrogen cycles hydrologic and rock cycles hydrologic and tectonic cycles rock and tectonic cycles Weegy: carbon and nitrogen cycles User: The following are biogeochemical cycles, important for recycling and balancing Earth's materials that are essential to life. hydrologic, rock, and tectonic cycles hydrologic, carbon, phosphorus, and nitrogen cycles rock, phosphorus, carbon, and nitrogen cycles tectonic, hydrologic, and carbon cycles Weegy: a User: do you mean hydrologic, rock and tectonic User: The movement of Earth's lithosphere is caused by convection within the ___ layer of the earth. User: The movement of Earth's lithosphere is caused by convection within the ____ layer of the earth. Core, Mantle, Crust Weegy: The movement of Earth's lithosphere is caused by convection within the Mantle layer of the earth. (More)
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