Answer: Spiracles.
- A Spiracles
- B Ostia
- C Nephridiopores
- D Stomata
Correct answer: A. Spiracles
Explanation: Cockroaches respire through a network of tracheal tubes that open to the exterior through small pores called spiracles, delivering oxygen directly to tissues.
The four basic animal tissue types and their core functions: epithelial (covering/lining), connective (support and transport), muscular (movement), and neural (signal conduction).
Concept context
The four basic animal tissue types (epithelial, connective, muscular, neural) and the cockroach as a model organism for organ-system level organisation.