Final answer:
Forensic experts need to be familiar with cell biology, botany, and entomology to analyze trace evidence and provide scientific evidence for use in courts.
Step-by-step explanation:
Forensic experts need to be thoroughly familiar with all of the above, which includes cell biology, botany, and entomology. Cell biology is the study of cellular structure and function. Botany is the study of plant life, and entomology is the study of insects. By understanding these subjects, forensic experts can analyze trace evidence, such as plant material or insect larvae, found at crime scenes to gather important information and provide scientific evidence for use in courts.