Ad the bacterium, even after being mixed with water and boiled. The bacterium is not susceptible to the penicillin family of antibiotics. It contains no plasmids and relatively little peptidoglycan. Adherence to the intestinal lining by this bacterium is due to its possession of .

Fimbriae

Explanation:

The fimbria is a type of pilus possessed by some bacteria (Gram positive or negative) specially designed for attachment to surfaces or to neighbouring cells.

Pili are generally thread-like or hair-like outgrowths on the surface of bacteria or other prokaryotic cells. While some function as structures for attachment are often referred to as fimbriae, some function by stabilizing mating bacteria during conjugation process.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.