Ticks and mites are actually

What is common among silver fish,scorpion,crab,and honey bee?

Which phylum in the animal kingdom has the highest number of species?

Which of the following pairs has an open type of circulatory system?

$A$: Chitinous exoskeleton is a characteristic feature of arthropods.
$R$: It allows diffusion of water vapour from atmosphere to the body.

Segmented body,exoskeleton of chitinous cuticle,and presence of haemocoel are the characteristics of