After the initial attachment step, A. tumefaciens produces a network of ________fibrils that bind the bacterium tightly to the plant cell surface. 

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#Question id: 12301

#Unit 7. System Physiology – Animal

Which of the following would likely lead to hyponatremia?

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#Question id: 12371

#Unit 10. Ecological Principles

Succession results from disturbance by fire.

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#Question id: 12372

#Unit 10. Ecological Principles

In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a  single species dominated the field. A possible factor in this secondary succession was

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#Question id: 12373

#Unit 10. Ecological Principles

You are most likely to observe primary succession in a terrestrial community when you visit a(n) 

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#Question id: 12374

#Unit 10. Ecological Principles

The process in which pioneer species colonize a bare substrate such as rock, sand, or glacial till is known as

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#Question id: 12375

#Unit 10. Ecological Principles

When lichens grow on bare rock, they may eventually accumulate enough organic material around them to supply the foothold for later rooted vegetation. These early pioneering lichens can be said to do what to the later arrivals?