Underline the sentence that presents anexample of systems biology in practice．

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Identifying and modeling the effects of a new drug on genes，proteins，cell structure，and so on is one way to use systems biology in the marketplace．This is the only sentence in the passage that indicates a practical use for the discipline．

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1 回答题：
More than half of all birds fallinto the category of perching birds，or passerines．Most， but not all，passerines are also categorizedas songbirds．This includes seedeaters，insectivores，and birds that sip nectar．As you Can tell，the order is remarkably
Line diverse，ranging from ravens to wrens，from wagtails to warblers．They have some (5)physical characteristics in common:all have three toes that point forward andone that points backward(enabling perching)，and allhave 12 tail feathers．Passerine eggs are often pastelin color，as opposed to the white eggs of most otherbirds．Passerines are described as altricial，which means that they produce young that remain in a helpless orimmature condition for some time，requiring muchparental care． Consider each of the choices separatelyand select all that apply．
Based on the definition given in the passage，which of these might be considered altricial species?

Select one answer choice．

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2 If an unfamiliar bird laid a blue egg，which other trait or attribute would best indicate that it wasalmost certainly a passerine?

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3 Underline the sentencethat directly contrasts an attribute of passerines with that of other birds．

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