The atmosphere contains about 80% nitrogen gas, but nitrogen in this form cannot be used by plants. which of the following processes converts atmospheric nitrogen to a useful form for plants?
a nitrogen decomposition b nitrogen fixation
c photosynthesis
d transpiration

mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

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brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

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