What are arthropods?

Arthropods are animals with a hard external skeleton like a suit of armour. The skeleton is jointed to allow movement. Arthropods have evolved in a different way to vertebrates and even their blood is chemically different and so it is not red. They do not have a brain and spinal cord like vertebrates. Instead, they have a nerve cord running along the underside of their body, and small thicknings of this nerve cord instead of a brain. Arthropods have efficient eyes, but these work in a different way from those of vertebrates. Arthropods such as spiders may have many eyes.

Fact file

The most important groups of arthropods are the following: (1) insects; (2) crustaceans (including this red-banded sea shrimp); (3) arachnids; (4) chilopods or centipedes; and (5) diplo-pods or millipedes.

resources: Tell me what (Chancellor Press)
image 1: https://butterflywonderland.com/wp-content/uploads/2016/04/Tutorial40_Fig8.jpg
image 2: https://www.leaveonlybubbles.com/wp-content/uploads/arthropods.jpg