How are mollusks and worms different?

Mollusks are invertebrates such as snails, scallops, and squids. Different classes of mollusks have different ways of obtaining food. Annelids are segmented worms such as earthworms and leeches. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system.

What is one way roundworms and mollusks differ?

Roundworms and rotifers have a more highly evolved gut than flatworms. Mollusks are coelomates with a muscular foot, a mantle, and a digestive tract with two openings. Segmented worms have segments that allow for specialization of tissues and for efficiency of movement.

What evidence shows that mollusks and segmented worms are related how are they different?

Evolution of Mollusks Scientists believe these two groups are related because, when they are in the early stage of development, they look very similar. Mollusks also share features of their organ systems with segmented worms. Unlike segmented worms, however, mollusks do not have body segmentation.

What type of digestive system do mollusks have?

6. Clams (and all mollusks) have a complete digestive system. It consists of a mouth where food is ingested, a short connecting tube called the esophogus, a stomach which temporarily holds food, and an intestine where food digestion and absorption takes place.

How are echinoderms and mollusks similar different?

Mollusks have soft bodies, and most secrete a shell to protect it. Echinoderms don’t have shells, but they have other means of protection. Their name comes from the Greek words for “spiny skin,” and many echinoderms such as sea urchins have long spines growing from their bodies.

Do mollusks have a respiratory system?

Basically all molluscs breathe by gills that are called ctenidia (comb-gills) because of their comb-like shape. In terrestrial molluscs this respiration organ is reduced, but still respiration takes place in the pallial cavity. That is why it is also called the snail’s respiratory cavity.

What’s the difference between segmented worms and roundworms?

One of the most prominent differences between roundworms and segmented worms is their circulatory systems. Segmented worms have a complete circulatory system, while round worms do not. Roundworms have no hearts or blood vessels. Roundworms use diffusion to breathe and pass nutrients throughout their bodies.

How are worms DIfferent from each other?

The primary difference between a virus and a worm is that viruses must be triggered by the activation of their host; whereas worms are stand-alone malicious programs that can self-replicate and propagate independently as soon as they have breached the system.

What is the difference between Mollusca and Arthropoda?

Mollusks are the soft-bodied invertebrates with one or two shells, whereas arthropods are the invertebrates with segmented bodies, jointed legs and appendages. Furthermore, mollusks have mantles that secrete calcareous outer or inner shell while arthropods have an exoskeleton made up chitin.

What is respiration in Mollusca?

How molluscs differ from other phylum describe?

Although there is no single feature that all molluscs possess, three features are so common in molluscs that they are used to distinguish them from organisms in other phyla: Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs.

How can the endoskeleton of echinoderms be compared to similar structures among vertebrates arthropods and molluscs?

How can the endoskeleton of echinoderms be compared to similar structures among vertebrates, arthropods and molluscs? The skeleton of echinoderm is internal; that is, it is an endoskeleton. It is made of calcium carbonate (calcareous). Some molluscs have a calcareous shell that functions as an exoskeleton.