In which organism flame cells form the excretory system? a. flatworms b. earthworms c. insects d. crabs
Option a. A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms, rotifers and nemerteans. The cells in the tubules are called flame cells (or protonephridia) because they have a cluster of cilia that looks like a flickering flame when viewed under the microscope.
