Nitrogen Fixation by Frankia Bacteria Is Efficient Enough to Allow

question 48

True/False

Nitrogen fixation by Frankia bacteria is efficient enough to allow alder trees to grow in the absence of combined nitrogen.

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Presidential Spouses

The husbands or wives of the Presidents of the United States, often involved in various social and political duties during their tenure.

Head of State

The chief public representative of a country, such as a president or monarch, who may also serve as the symbolic leader or executive head, depending on the form of government.

First U.S. First Lady

Martha Washington, the spouse of George Washington, the first President of the United States, serving as the inaugural First Lady.

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