Explain how to distinguish between these arthropod spiders i

Solution

By simply looking at them, you can make the distinction.

Spiders have four pairs of legs and a cephalothorax, means head and thorax are fused together.

Insects have head, thorax and abdomen; they have 3 pairs of legs.

Millipedes\' body has many segments. Each segment has one pair of legs.

Centipedes\' body also has many segments. And each segment has two pairs of legs.