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The domain that contains unicellular organisms that live in extreme environments is A. Eubacteria. B. Eukarya. C. Archaea. D. Bacteria.
Weegy: C. Archaea. Domain Archaea- unicellular prokaryotes with cells walls. Live in extreme environments. User: Look at Figure 19–1. Which of the following theories explains why the edges of Africa and South America fit together like two pieces of a puzzle? A. endosymbiosis B. macroevolution C. plate tectonics D. punctuated equilibrium Weegy: C. plate tectonics User: The separation of populations by barriers such as rivers, mountains, or bodies of water is called A. temporal isolation. B. geographic isolation. C. behavioral isolation. D. genetic equilibrium. Weegy: The separation of populations by barriers such as rivers, mountains, or bodies of water is called B. geographic isolation User: The genes carried by all members of a particular population make up the population’s A. allele frequency. B. phenotype. C. genotype. D. gene pool. (More)
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Asked 4/22/2013 10:46:34 AM
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Why did oceans not exist on Earth nearly 4 billion years ago? A. No water molecules were present. B. Water remained a gas because Earth was very hot. C. Water existed as ice because Earth was very cold. D. There was no oxygen gas in the atmosphere.
Weegy: Why did oceans not exist on Earth nearly 4 billion years ago? B. Water remained a gas because Earth was very hot. (More)
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Asked 4/22/2013 10:43:40 AM
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What begins when a neuron is stimulated by another neuron or by a stimulus in the environment? A. a threshold B. a resting potential C. an impulse D. a dendrite
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Updated 4/22/2013 12:05:06 PM
1 Answer/Comment
C. an impulse begins when a neuron is stimulated by another neuron or by a stimulus in the environment.
Added 4/22/2013 12:05:25 PM
Which receptors respond to a scraped knee? A. thermoreceptors B. pain receptors C. chemoreceptors D. photoreceptors
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Updated 261 days ago|6/11/2016 5:39:56 PM
1 Answer/Comment
Pain receptors respond to a scraped knee.
Added 261 days ago|6/11/2016 5:39:56 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by Andrew. [6/12/2016 7:11:00 PM]
Which receptors respond to a scraped knee? A. thermoreceptors B. pain receptors C. chemoreceptors D. photoreceptors
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Updated 6/4/2015 2:01:59 AM
1 Answer/Comment

Pain receptors respond to a scraped knee.
Added 6/4/2015 2:01:59 AM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by yumdrea [6/4/2015 2:35:36 AM]
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