Why was the evolution of the extraembryonic membranes crucial for colonization of land by the vertebrates? Extraembryonic membranes ________.

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#Question id: 11076

#Unit 7. System Physiology – Animal

Which of the following will decrease pulmonary blood flow resistance?

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#Question id: 1855

#Unit 4. Cell Communication and Cell Signaling

Of the following, the most urgent need for an improved vaccine relates to:

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#Question id: 12176

#Unit 8. Inheritance Biology

In a Z-linked characteristic, Cameo plumage, which produces brown feathers, while the wild-type plumage is a glossy metallic blue. If  a pure blue-colored male is crossed with a cameo female, then what will be the probability of blue and cameo plumage of male and female in F2 phenotype?

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#Question id: 12814

#General Aptitude

The difference between the length and breadth of a rectangle is 23m. If its perimeter is 206 m, then its area is

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#Question id: 34103

#Unit 2. Cellular Organization

A. A CEN fragment derived from one chromosome can replace the centromere of another chromosome with no apparent consequence.

B. CEN are used simply to attach the chromosome to the spindle, and play no role in distinguishing one chromosome from another.