Ques:Q: Of the nine classes of vertebrates, how many are fish? Read this paragraph and choose the correct option from the provided answers: Of course. But what type? Of the nine classes of vertebrates, five are fish. Each of the five classes has distinguishing characteristics that allow members to be classified appropriately. Stingray are cartilaginous fish, related to sharks. 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? Read this paragraph and choose the correct option from the provided answers: 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? Read this paragraph and choose the correct option from the provided answers: Osteoporosis is a disease in which bones lose mass and become more fragile than they should be. Osteoporosis also makes bones more likely to break. Two of the easiest ways to prevent osteoporosis are eating a healthy diet that has the right amount of calcium and vitamin D and to do some sort of weight-bearing exercise every day. Foods that are a good source of calcium include milk, yogurt, and cheese. Non-dairy sources of calcium include Chinese cabbage, kale, and broccoli. Many fruit juices, fruit drinks, tofu, and cereals have calcium added to them. It is recommended that teenagers get 1300 mg of calcium every day. For example, one cup (8 fl. oz. ) of milk provides about 300 mg of calcium, or about 30% of the daily requirement. 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? Read this paragraph and choose the correct option from the provided answers: Many species use their body shape and coloration to avoid being detected by predators. The tropical walking stick is an insect with the coloration and body shape of a twig which makes it very hard to see when stationary against a background of real twigs (Figure 45.20a). In another example, the chameleon can change its color to match its surroundings (Figure 45.20b). Both of these are examples of camouflage, or avoiding detection by blending in with the background. Choices: - exposure - sunlight - human contact - detection by predators A:

Ans:
detection by predators
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