Question

Name two animals which move without bones.

Answer 1

Hint: All invertebrates do not have bones or bony skeletons in their body. All the organisms from the phylum Porifera to the phylum hemichordata move without bones.

Complete Answer:
Organisms which do not have any type of bony skeleton or move without the bones are:
1. Earthworm: Earthworm is an invertebrate. It has a tube-like structure that has parapodia.
- Earthworm, also called a farmer’s friend, is classified under the phylum Annelida.
- The characteristic feature of phylum Annelida is the presence of parapodia. Parapodia helps in the locomotion of the annelids. So, earthworms also move with the help of parapodia.

2. Starfish: Starfish comes under the phylum Echinodermata. Members of this phylum are completely marine.
- Starfish has 5 arms, and on the dorsal side, each arm has a lot of tube feet. Tube feet help in the locomotion of starfish.
- Starfish moves with the help of tube feet via a water vascular system (the system that uses water to help in locomotion).

So, two animals that move without bones are earthworm and starfish.

Note: Other animals which move without bones
- Snail (phylum Mollusca)
- Jellyfish (phylum Cnidaria)
Not only invertebrates but there are some vertebrates that move without bones.
- Snakes (Class Reptilia)
- Fish (Class Pisces, Sub-class Chondrichthyes).