The unit is called Ecosystem.
Ecological units comprise concepts such as population, community and ecosystem.
<em>An ecosystem</em> is a community of plans and animals interacting with each other in an particular area. They also interact with their non-living environments (water, earth, sun, soil, climate and atmosphere).
The robins are in relationship with the earthworms because the robins eat them in order to survive and as a part of the food chain. The food chain is a linear sequence of organism through which nutrients and energy pass as one organism eats another. Ecosystems consist of creatures that mutually benefit from each other.
Proponents of the North American Free Trade Agreement (NAFTA) argued that it would help the U.S. economy by "<span>b. opening up new markets for the export of American goods" since it formed alliances. </span>
The allegiance against Iraq.
I’m fairly certain on which president Bush we’re talking about, but if I am wrong let me know. After the 9/11 I’m events, the Bush administration propelled an allegiance towards a group that he called the “axis of evil” which included Iran, Iraq, and North Korea.
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Answer:
World War 1
Explanation:
Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson's decision to lead the United States into World War I.