The microorganisms that do not have a nucleus in their cells are ALL called:

a
prokaryotes
b
eukaryotes
c
decomposers
d
algae

a) prokaryotes

The correct answer is: a) prokaryotes.

The correct answer is a) prokaryotes. Prokaryotes are microorganisms that do not have a nucleus in their cells. They are simple organisms that lack membrane-bound organelles, including a nucleus. Prokaryotes include bacteria and archaea.

To arrive at this answer, you can use your knowledge of biological classification and cell structure. The term "prokaryote" refers specifically to organisms that lack a defined nucleus. On the other hand, eukaryotes (answer b) are organisms with cells that contain a nucleus. Decomposers (answer c) are a group of organisms that break down dead organic matter, but they can include both prokaryotes and eukaryotes. Algae (answer d) are a diverse group of photosynthetic organisms that can include both prokaryotes (like cyanobacteria) and eukaryotes. By process of elimination, you can determine that the correct answer is a) prokaryotes.