What are the choices? I assume it has something to do with eating...
The theory of spontaneous generation exclaimed that living organisms could arise from non-living matter.
Schwann affected this theory by demonstrating that fermentation required the presence of yeasts to start and that was not caused by oxygen as was speculated.
Schwann concluded by his experiments that sugar was converted to alcohol as part of an biological process based on the action of a living organism - the yeast.
Answer:
A population is the smallest unit of living organisms that can undergo evolution within a given species.
Explanation:
The substance is called DNA.
