Spiders and scorpions are included in which class?

Which is the largest animal phylum in terms of species count?

Insects have:

Which of the following features is not present in the Phylum Arthropoda?

For observing a haemocoel,which animal would you select?

In many arthropods,the head and thorax are fused to form a cephalothorax. However,in which of the following classes of animals is the body divided into head,thorax,and abdomen?