Answer:
<h3>The spread of an infection within a community is described as a “chain,” several interconnected steps that describe how a pathogen moves about. Infection control and contact tracing are meant to break the chain, preventing a pathogen from spreading.</h3>
Waves of muscular contractions that propel the contents of the digestive tract are called peristalsis.
The answer would be A depending on if they were reliable to live on their own so the answer would be C, but you must be 18.