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What is the name for a fossil that is common to a particular period of geologic time and serves as an indicator for that time? A. coprolite
B. microfossil C. index fossil D. stromatolite
The answer is C. index fossil
Expert answered|jher000|Points 7504|
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Asked 7/24/2012 12:39:21 PM
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who discovered that it is possible to alter a magnetic reading using an electric current?
Weegy: Oersted in Denmark (More)
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Asked 7/23/2012 11:58:27 AM
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Choose two consecutive sections of geologic time (for example, Triassic and Jurassic, or Cambrian and Ordovician). What distinguishes these periods from one another? What was going on geologically then? What kinds of plant and animal life were common during these periods?
Weegy: The Triassic–Jurassic extinction event marks the boundary between the Triassic and Jurassic periods, 199.6 million years ago,[1] and is one of the major extinction events of the Phanerozoic eon, profoundly affecting life on land and in the oceans. [ In the seas a whole class (conodonts)[2] and twenty percent of all marine families disappeared. On land, all large crurotarsans (non-dinosaurian archosaurs) other than crocodilians, some remaining therapsids, and many of the large amphibians were wiped out. At least half of the species now known to have been living on Earth at that time went extinct. This event vacated terrestrial ecological niches, allowing the dinosaurs to assume the dominant roles in the Jurassic period. This event happened in less than 10,000 years and occurred just before Pangaea started to break apart. In the area of Tübingen (Germany), a Triassic-Jurassic bonebed can be found, which is characteristic for this boundary.[3] Statistical analysis of marine losses at this time suggests that the decrease in diversity was caused more by a decrease in speciation than by an increase in extinctions. Several explanations for this event have been suggested, but all have unanswered challenges: Gradual climate change, sea-level fluctuations or a pulse of oceanic acidification[5] during the late Triassic reached a tipping point. However, this does not explain the suddenness of the extinctions in the marine realm. Asteroid impact, but so far no impact crater of sufficient size has been dated to coincide with the Triassic–Jurassic boundary. ] (More)
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Asked 7/23/2012 12:16:37 PM
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The early Paleozoic era was the time of the Cambrian explosion. What happened during the Cambrian explosion? A. Earth was undergoing lots of contractions as it cooled off. B. There were frequent earthquakes and lots of volcanic eruptions. C. Earth was bombarded by a great number of asteroids and comets. D. Many new life-forms appeared, including most of the known types of invertebrates.
Weegy: Fish, arthropods, amphibians and reptiles all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms. (More)
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Asked 7/24/2012 12:09:27 PM
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During which period did the first large herbivores and carnivores appear? A. Devonian B. Mississippian C. Pennsylvanian D. Permian
Question
Updated 26 days ago|9/3/2014 4:45:53 PM
1 Answer/Comment
During the PERMIAN period, the first large herbivores and carnivores appear.
Added 26 days ago|9/3/2014 4:45:53 PM
The term fossil is best defined as _________. A. bones and teeth B. any evidence of past life C. something that is really old D. the preservation of an entire organism
Question
Updated 89 days ago|7/2/2014 10:52:32 AM
1 Answer/Comment
The term fossil is best defined as the preservation of an entire organism.



Added 89 days ago|7/2/2014 10:52:32 AM
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