Which of the following does the arthropod class arachnida not include?
ticks
scorpions
spiders
none of the above

none of the above

Explanation:

Arachnida is the class of joint legged invertebrate animals. Almost all the organisms in this class exhibit eight legs. The front pair of the legs have a sensory function. Spiders are the largest order of animals in this class. This order includes organisms such as scorpions, mites, ticks, solifuges and harvestmen.

On the basis of the above explanation, among the given option, none of the above is the correct one.

the correct answer is:

a. formation of precipitation