Answer: moist skin.
- A moist skin
- B paired lungs
- C feathery gills
- D branching trachea
Correct answer: A. moist skin
Explanation: The earthworm respires through its moist skin.
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.