Which sentence is evidence that arthropods molt multiple times during their lives? invertebrates invertebrates are animals that do not have a backbone. this term distinguishes these animals from vertebrates, which are animals that have a spinal column. a snail at the beach, an insect in a tree, and an earthworm in the soil are all kinds of invertebrates. the invertebrate group can be divided into many smaller groups or classifications. for example, one major group of invertebrates is arthropods. lobsters, insects, and spiders are all arthropods. arthropods have an exoskeleton, which is a hard outer or external skeleton that supports and protects the animal. the exoskeleton is a shell that covers the animal’s body. the exoskeleton does not grow along with the rest of the animal. it must be shed and formed anew as the animal becomes increasingly larger. this process is called molting, and it occurs at different stages of growth and development. while the new exoskeleton hardens, the animal is less protected.