Question

a glowworm is not really a worm. it is a type of a small fly that gives off light. b butterfly that eats other bugs. c spider that lives in caves. d bat that spins silk.

Explanation:

Glow - worms are not actual worms. They are small insects that can bioluminesce, which means they give off light. They are often small flies in their adult or larval stages.

Answer:

A. small fly that gives off light.