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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 10:55:43 AM
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The atmosphere has many functions, such as _____. sustaining life with oxygen filtering harmful rays from the Sun removes nutrients from the soil helps to protect Earth from meteor collisions keeps the earth's climate unstable
Weegy: filtering harmful rays from the sun User: Earth's climate history can be studied by analyzing _____. soil and dirt ice cores and rock records fossils of plants and animals oceans and lakes Weegy: sustaining life with oxygen filtering harmful rays from the Sun User: Earth's climate history can be studied by analyzing _____. soil and dirt ice cores and rock records fossils of plants and animals oceans and lakes Weegy: The right ... (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 ... (More)
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Asked 9/25/2012 9:57:56 AM
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igenous rock material changes into metamorphic rock by sedimentation compaction and cementation heat and pressure
Weegy: Is this a true or false question? Please specify. User: igenous rock material changes into metamorphic rock by A sedimentation B compaction and cementation C heat and pressure Weegy: C heat and pressure (More)
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