Two balls are to be drawn from a bag containing 5 red and 7 white balls. Find the chance that they will both be white

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#Question id: 1820

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is TRUE of histamine?

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#Question id: 13552

#Unit 6. System Physiology – Plant

Transpiration from the leaf depends on two major factors;

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#Question id: 12429

#Unit 10. Ecological Principles

Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.

Which of the following organisms is incorrectly paired with its trophic level? 

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#Question id: 1958

#Unit 4. Cell Communication and Cell Signaling

Both the eye and the respiratory tract are protected against infections by which of the following?

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#Question id: 11144

#Unit 7. System Physiology – Animal

The membrane potential in which there is no net movement of the ion across the membrane is called the ________.