Answer:atom
Explanation:because it is defined as the smallest form of any given elemental item
1. Variations
2. Extinction
3. Behavioral
4. Functional
5. Structural
A-genetic material(RNA since influenza is a ribovirus)
B-membrane
C-capsid
Most flatworms take in food via their mouth, then move it into a digestive gut that attaches to the digestive structures. The food then breaks down and is absorbed out into the rest of the organism. Some have an anus to remove wastes, but most don't and will simply excrete unused food through the mouth.
