What is a biofilm?
a. A group of bacteria that accumulate in layers and secrete a protective extracellular material
b. A layer of sugars that persist even after bacteria have been killed by antibiotics
b. Free-floating bacteria that move through the blood to other sites
c. A bacterial cell that secretes an extensive network of fibers around its cell wall

A group of bacteria that accumulate in layers and secrete a protective extracellular material. (Option A)

Explanation:

Biofilm is defined as one or more types of microorganisms collectively grow in different places. Organisms that form the biofilm include protests, fungi, and bacteria.

Dental plaque is an example of a biofilm. It is a known buildup of slimy bacteria that forms on the teeth surface. Biofilm can grow on different surfaces such as animal tissues, plant tissues, minerals, metal, etc.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

answer: that would be cheating

explanation: