Question

Name two animals that move without bones.

Answer 1

Hint: One of the two animals that move without bones belongs to the phylum Annelida. Its whole body is segmented that looks like many small rings fused together and each individual contains both male and female sex organs. The second animal belongs to the phylum Mollusca. It has a shell as a part of the body that protects the animal from predators, mechanical damage, and dehydration.

Complete answer:
The two animals which can move without bones are earthworm and snail. An earthworm is a terrestrial invertebrate that is segmented with internal segmentation and has setae on all segments. They occur where soil and temperature allow and eat a variety of organic matter which are commonly found in soil which includes plant matter, bacteria, fungi, microorganisms, and living protozoa and rotifers. A snail is a shelled gastropod that contains a coiled shell that is large for the animal to retract completely into it and constitutes numerous species of sea snails and freshwater snails. They are considered for human relevance as they provide food items, act as pests and vectors for diseases, and their shells are used as decorative objects or are incorporated into the jewelry. They respire by using lungs that belong to the group Pulmonata and some species have gills which are a form of polyphyletic group and the nails with lungs and gills form several taxonomic groups that are closely related to some other groups.

Additional information:
-Earthworms lack sex structures and are fully formed which develop within about 60 to 90 days.
-They attend their full size in one year and have an average lifespan of 428 years with most Garden varieties that live only 1 to 2 years.
- Some species of earthworm are parthenogenetic, that is the growth and development of the embryo which happens without fertilization and arose from sexual relatives many times.
-There mating occurs on the surface and most often at night.
-Earthworms are hermaphrodites and the sexual organs are located in segments 9 to 15 with two pairs of testis contained within the sacs.
-The snails are found in a variety of environments and have a thousand of the microscopic tooth-like structures which are located on the tongue known as a radula.
-Some species of snails are herbivorous which eat plants or rasping algae from the surfaces and cannot absorb colored pigments while eating paper or cardboard so their feces are also colored.

Note:
-Earthworm constitutes 2700 species and can be more than a million earthworms in one acre of land. -The snails use their venomous harpoon known as the toxoglossan radula to capture their moving prey faster and the venom for larger species is powerful enough to kill a human being.