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.
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The time at Valley Forge was not pretty. It was extremely cold which made it very hard to function well. There was also a ton of disease spreading as well, so the correct answer.
So, after making camp at Valley Forge in Pennsylvania, Washington's troops were reduced in size after men died from disease and exposure to the harsh winter.
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