Which of these is one of the earliest-known groups of arthropods?
Correct answer: Trilobites

Player-T G 3503313
They remind me of horseshoe crabs

little b
I've not heard of the trilobites

kat
Player #25874027, I actually have a fossil of one

Player #25874027
I recognised that they are fossils so are likely to have been the earliest group

SilverLynxCat
thank you Dinosaur Train

VividPotion6704
Player #3503313, they remind me of woodlice