Entomology is the biological field of research on insects. It is a field of zoological life sciences. Entomology is the study of insects. Thus, option b is correct.
Entomology is the branch of life science and zoology that has been concerned with the study and research of insects. It also has been including the arthropod groups that can be studied too.
It is the field that has been dealing with the insects that have segmented bodies and include the study of morphology, genetics, behavior, ecology, taxonomy, pathology, and physiology.
Therefore, option b. Entomology is associated with insects.
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