How much of Earth's atmosphere is made up of nitrogen and oxygen? A. 100 percent B. Between 25 and 75 percent C. Close to 99 percent D. Less than 1 percent

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Close to 99 percent of Earth's atmosphere is made up of nitrogen and oxygen.

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Asked 12/22/2015 3:32:41 PM

Updated 12/23/2015 9:52:29 AM

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Unlike mammals, fish A. can take in oxygen from the air. B. utilize gills for gas exchange. C. need oxygen to survive. D. release carbon dioxide.

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Updated 8/29/2016 5:05:49 AM

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Wallet.ro

Unlike mammals, fish utilize gills for gas exchange.

Added 8/29/2016 5:05:49 AM

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Confirmed by Andrew. [8/29/2016 5:24:01 AM]

Which group of chordates does not possess true backbones? A. Lampreys B. Crocodilians C. Birds D. Frogs and toads

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Updated 2/9/2016 1:50:57 AM

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Wallet.ro

Lampreys: group of chordates that does not possess true backbones.

Added 2/9/2016 1:50:57 AM

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Confirmed by jeifunk [2/9/2016 2:15:30 AM]

Which of the following accurately describes the angiosperm plant life cycle? A. The anther produces eggs. B. The ovule develops into an anther. C. The ovary is haploid. D. The embryo develops into a seedling.

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Updated 3/13/2016 9:43:21 AM

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Wallet.ro

The embryo develops into a seedling accurately describes the angiosperm plant life cycle.

Added 3/13/2016 9:43:21 AM

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Confirmed by Andrew. [3/13/2016 6:10:45 PM]

Like chordates, all invertebrates have A. tails. B. backbones. C. eukaryotic cells. D. pharyngeal pouches.

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Updated 8/4/2016 3:59:15 AM

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Wallet.ro

Like chordates, all invertebrates have tails.

Added 8/4/2016 3:59:15 AM

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Confirmed by jeifunk [8/4/2016 9:07:41 AM]

Which of the following is not a major function of the roots? A. Photosynthesis B. Providing a membrane in which osmosis moves water across C. Uptake of nutrients D. Development of root pressure that drives movement

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Updated 12/16/2015 12:02:26 AM

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paral

Photosynthesis is not a major function of the roots.

Added 12/16/2015 12:02:26 AM

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Confirmed by Andrew. [12/16/2015 2:35:49 AM]

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