Biological barriers are living organisms that help protect the body.
O True
O False

Hello lizbethpaz176!

A. True

Explanation:

Biological barriers are living organisms that help protect the body from pathogens. Trillions of harmless bacteria normally live on the human skin and in the urinary, reproductive, and gastrointestinal tracts. These bacteria use up food and surface space that help prevent pathogenic bacteria from colonizing the body.