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Earth and Venus are often called sister planets' in what ways are they most alike?

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In mice, black is dominant to white color and color is determined by a single gene. Two black mice are crossed. They produce 2 black offspring and one white offspring. If the white offspring is crossed with one of its parents, what percent of the offspring are expected to be white?

ĐỀ SỐ 22During the last 25 years, Britain's urban sparrow population has declined by as (0)_MUCH _ as two-thirds, and the bird has almost disappeared from many of (1) _________former haunts. The decline has been blamed on everything from cats to garden pesticides. Moreover, modern buildings have far (2) _________ few nooks and crannies (3) _________the birds can nest. Factors (4) _________ these may well be involved, but alone they fail to explain the severity of the decline, or the fact that other urban birds have been less affected.Denis Summers-Smith is the world's leading expert on sparrows, so when he (5)_________ up with a theory to explain their decline, it has to be (6) _________ listening to. He suggests that the culprit is a chemical added to unleaded petrol. It would be deeply ironic if a policy that was intended to improve the nation's health was to prove responsible for the decline of (7) _________ of its favorite species. According to Summers-Smith, social species such as the sparrow require a minimum population in a specific area to breed successfully. If, (8) _________ whatever reason, numbers drop (9) _________ this threshold, the stimulus to breed disappears. The most dramatic example is the passenger pigeon, which in the late nineteenth century went from(10) _________ the world's most common bird to total extinction within 50 years.

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