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Which group of animals evolved first? a. echinoderms b. chordates c. flatworms d. cnidarians
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Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation
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Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.
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What element is able to combine with itself and hydrogen to form large molecules ?
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The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the womanโs offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction
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Which group of animals evolved first? a. echinoderms b. chordates c. flatworms d. cnidarians...
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