McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

What group of organisms plays a critical role in delivering nitrogen to plants?

A. ammonifying bacteria
B. nitrogen-fixing bacteria
C. birds
D. defecating herbivores and carnivores


2. What group of organisms plays a global role in returning nitrogen to the atmosphere?

A. nitrogen-fixing bacteria
B. ammonifying bacteria
C. nitrifying bacteria
D. denitrifying bacteria
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