Question

In arthropod, head and thorax are often fused to form cephalothorax, but in which one of the following classes, is the body divided into head, thorax and abdomen?
A)Crustacea
B)Arachnida and Crustacea
C)Insecta
D)Myriapoda

Answer 1

Hint: Insects are the only invertebrates to flight mechanism developed, and all flying bugs derive from one not unusual place ancestor. Many bugs spend as a minimum a part of their lives beneath the water, with larval diversifications that include gills, and a few grownup bugs are aquatic and feature diversifications for swimming.

Complete answer:
Class Hexapoda ( Insecta ) has 900,000 species. Insects first advanced three hundred million years ago. Their body is split into 3 sections: head, thorax, abdomen. Insects have 6 legs and commonly 1 or 2 pairs of wings.

Insects are a category of invertebrates inside the Arthropoda phylum which have a chitinous exoskeleton, a 3-parts in body - head, thorax and abdomen, 3 pairs of jointed legs, compound eyes.

Insects are the most abundant organisms in the animal kingdom. They consist of greater than one million described species and constitute greater than 1/2 of all acknowledged living organisms. The general range of extant species is anticipated at among six and ten million; probably over 90% of the animals on Earth are bugs. Insects can be discovered in almost all environments, even though at best a small range of species are living within the oceans, that is ruled by way of means of every other arthropod phylum, crustaceans, which latest studies have indicated insects are an element of.

Hence, the correct answer is option (C)

Note: Other terrestrial arthropods, such as centipedes, scorpions, millipedes, spiders, ticks and mites, and are occasionally confused with insects considering their body plans can seem similar, sharing (as do all arthropods) a jointed exoskeleton. However, upon closer examination, their functions vary significantly; maximum noticeably, they now no longer have the six-legged feature like the insects.