Which one of the following do scientists rely on to estimate when extinct, ancient eukaryotes were present on Earth?

Question

Quizplus · Accepted Answer

Scientists rely primarily on the fossilized remains of cell walls to estimate when extinct, ancient eukaryotes were present on Earth. While DNA can sometimes be extracted from fossils, it is not always preserved and can be difficult to analyze. Chloroplasts and nuclear membranes are specific organelles that may not be present in all eukaryotes, so relying on their fossilized remains may not provide a complete picture of eukaryotic evolution.

Which One of the Following Do Scientists Rely on to Estimate