In the federal system, local governments are considered

subunits of State governments

Explanation:

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there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.

c.) biotic: snails; abiotic: temperature climate