xkcd #3204: Dinosaurs And Non-Dinosaurs
Title text:
Staplers are actually in Pseudosuchia, making them more closely related to crocodiles than to dinosaurs.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3204/
If penguins are still dinosaurs, then earth is still solely inhabited by single cell organisms and we’re clearly not.
I’ve never heard of a clade for single cell organisms, though there are some that only contain single cell organisms