Some of the oldest eukaryotic fossils are
A)difflugians.
B)radiolarians.
C)arcellians.
D)heliozoans.
E)bacteria.

Question

Quizplus · Accepted Answer

Radiolarians are single-celled eukaryotic organisms with silica shells. Fossilized radiolarians have been found dating back to the Proterozoic era, making them some of the oldest eukaryotic fossils. The other choices (difflugians, arcellians, and heliozoans) are also single-celled eukaryotes, but their fossil records generally do not extend as far back as the radiolarians. Bacteria are prokaryotes and do not have a nucleus or other membrane-bound organelles, so they are not eukaryotes and do not have eukaryotic fossils.

Some of the Oldest Eukaryotic Fossils Are