Select the vertebrate.
A: ladybug
B: earthworm
C: mosquito
D: rainbow trout
A mosquito is an insect. Like other insects, a mosquito is an invertebrate. It does not have a backbone. It has an exoskeleton.
A ladybug is an insect. Like other insects, a ladybug is an invertebrate. It does not have a backbone. It has an exoskeleton.
An earthworm is a worm. Like other worms, an earthworm is an invertebrate. It does not have a backbone. It has a soft body.
A rainbow trout is a fish. Like other fish, a rainbow trout is a vertebrate. It has a backbone.