Based on Word Central
- any of a group of extinct invertebrate animals that lived in Paleozoic seas, have a body composed of segments and divided lengthwise along the back into three parts, and are classified as arthropods
- any group of animals without a back bone that lived in prehistoric times that lived in the ocean. They are also called Arthropods.
Trilobites were alive during prehistoric times. Some are also fossilized.
- any of a group of extinct invertebrate animals that lived in Paleozoic seas, have a body composed of segments and divided lengthwise along the back into three parts, and are classified as arthropods
- any group of animals without a back bone that lived in prehistoric times that lived in the ocean. They are also called Arthropods.
Trilobites were alive during prehistoric times. Some are also fossilized.