Ques:Q: Of the nine classes of vertebrates, how many are fish? Choices: - one - four - three - five A:

Ans:five
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Ques:Q: But a point mutation can also change a codon for an amino acid into a what? Choices: - axon - exon - stop mutation - stop codon A:

Ans:stop codon
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Ques:Q: What is the disease in which bones lose mass and become more fragile and likely to break? Choices: - arthritis - tuberculosis - fibrosis - osteoporosis A:

Ans:osteoporosis
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Ques:Q: Many species use their body shape and coloration to avoid what? Choices: - exposure - sunlight - human contact - detection by predators A:

Ans:
detection by predators
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