The fantastic organism pictured below would surely qualify for a starring role in a horror film if it were a thousand times larger than it really is. in its active feeding stage, it is a single giant multinucleate cell that slides over moist organic matter, engulfing food particles as it grows. what is it?

a slime mold.

Explanation:

A slime mold is a Eukaryotic organism that can live freely as a single cell organism, but can also come together to form a multicell organism. When there is a lot of food, they choose to stay as a single cell organism. When food is short, they may come together in different forms and are able to detect food better. They feed on microorganisms that live on dead plant material. It is most common to find slime mold in nature. You can find them on soil, lawns, forest floors, and even some fruit.

not sure if this is what you'r looking for eubacteria and archaebacteria