Which of the following structures does the given figure represent?

Which of the following is true about neuroglial cells?

What is the function of gizzard in earthworm?

Which of these structures attach the testes to the kidneys in male frogs?

The cockroach body is covered by an exoskeleton made of __

How many spermathecal apertures are present in an earthworm?

Which of these is true about antennae of cockroaches?

Where does fertilization occur for the earthworm?