Which of the following is the study of insects and their relationship to humans, the environment, and other organisms ?

Entomology

The correct answer is Option (2)- Entomology

The correct answer is "Entomology."

1. Ornithology: Ornithology is the scientific study of birds.
2. Entomology: Entomology is the scientific study of insects and their relationships with humans, the environment, and other organisms. Entomologists study various aspects of insects, including their anatomy, physiology, behavior, ecology, and taxonomy.
3. Ethology: Ethology is the scientific study of animal behavior, particularly in natural environments. It encompasses the study of both innate and learned behaviors in animals.
4. Mycology: Mycology is the scientific study of fungi, including their biology, taxonomy, ecology, and pathology. Mycologists study various aspects of fungi, such as their morphology, reproduction, and interactions with other organisms.