Speciation is not a mechanism of microevolution.
I'm guessing the answer is a
What type of fungi is most closely related to club fungi?
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Club fungi is most closely related to sac fungi.

Answer:
is common because it promotes homeostasis
Explanation:
The negative feedback loop is a mechanism wherein a change in some condition stimulates a response to counteract the changed condition and thereby, the homeostasis is restored.
For example, an increased blood glucose level above its homeostatic level stimulates the secretion of insulin hormone from the pancreas which in turn stimulates the absorption of glucose from the blood into the cells (specifically the liver and muscle cells) and thereby restores the normal blood glucose levels.
Most of the processes in the human body are regulated by negative feedback loops to maintain the homeostasis.
I would have to say it was in the 1860s