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Fossils of fish appeared approximately 500 mya during the _____________. a. Archaen c. Proterozoic b. Cambrian d. Phanerozoic
Fossils of fish appeared approximately 500 mya during the Cambrian.
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Asked 11/14/2014 10:01:27 AM
Updated 11/14/2014 10:19:16 AM
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Confirmed by jeifunk [11/14/2014 10:19:16 AM]
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To which phylum do roundworms belong? a. Annelida c. Platyhelminthes b. Nematoda d. Arthropoda
Weegy: Roundworms belong to are phylum Nematoda. (More)
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Most arthropods have well-developed lungs. Please select the best answer from the choices provided T F
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Updated 11/14/2014 10:16:11 AM
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Most arthropods have well-developed lungs. TRUE.
Added 11/14/2014 10:16:11 AM
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Used by fish for balance, steering, and swimming, these structures are fan-shaped membranes supported by stiff spines. a. scales c. gills b. notochords d. fins
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