Final answer:
The term 'route of entry' on a Safety Data Sheet refers to the way a chemical can enter the body, including through skin absorption, inhalation, ingestion, or parenteral means such as needle punctures.
Step-by-step explanation:
The term route of entry on a Safety Data Sheet (SDS) refers to the way a chemical enters the body. There are several potential routes of exposure to chemicals, including absorption through the skin, inhalation through the respiratory tract, and ingestion via the digestive tract. Furthermore, pathogens can also enter through parenteral routes, which involve a breach in the protective barriers of the skin and mucous membranes. An example of a parenteral route is when the skin is pierced by a needle, allowing microorganisms to bypass the external barriers and enter directly into the bloodstream.