Question

Spiders and scorpions are very different from each other but are placed in the same phylum-arthropoda

Answer 1

because they both have 6 legs

Answer 2

Spiders and scorpions are different species of the same phylum Arthropoda. They both are different, but they have many characteristics in common, such as they both have jointed 6 legs, coelomic cavity filled with blood, open circulatory system, etc.