Decomposers get energy from dead or decaying matter. Examples are fungi, bacteria, some insects and snails.
Answer:
A. virus because it requires a host cell to reproduce
Explanation:
This is probably a viral disease (and from an internet search, I can confirm that it is). A good way to understand this is that from the information given, we should infer that it's a viral disease: viruses are microscopic, infectious, and need a host cell. Protists and fungi just aren't good answers, because protists don't infect people usually, and fungi are not always microscopic.
Division of labor is essentially when tasks are divided and carried out by specific parts. This occurs in cells, where different tasks are distributed among different parts, referred to as the organelles. For example, the mitochondria in the cell produce energy to carry out cellular activities. The nucleus is involved in cellular division and other genetic functions. In such a manner, the "labor" that a cell has to perform is divided among its organelles.
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