Answer: tissues.
- A tissues
- B planets
- C chemicals
- D only single cells
Correct answer: A. tissues
Explanation: An organ consists of two or more tissues working together.
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.