Why are cnidarians more complex than sponges?

Cnidarians are also simple aquatic animals like sponges, but their possession of a nerve system makes them more complex than sponges. Jellyfish, hydras, sea anemones, and corals make up the four classes of cnidarians. All cnidarians have tentacles around their mouths.

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Is a sponge a complex invertebrate?

Sponges, jellyfish, worms, snails, and squids. These are just a few of the many types of invertebrates. But there are lots more. In fact, most animals are invertebrates, so their classification is very important.


What is the simplest kind of invertebrate?

Sponges. The sponges (phylum Porifera) are among the simplest of the invertebrates.

Do all arthropods have wings?

All arthropods have jointed legs, claws, and body segments! Each body segment usually has a pair of appendages. The appendages can be antennae, wings, legs, or mouthparts!

What organs do arthropods have?

Arthropods are very highly cephalized, often with intricate mouthparts and elaborate sensory organs, including statocysts, antennae, simple eyes and compound eyes. Sensitive hairs on the surface of the body can detect touch, water currents, or chemicals.

How do arthropods help the environment?

Mites, ticks, centipedes, and millipedes are decomposers, meaning they break down dead plants and animals and turn them into soil nutrients. This is an important role because it supplies the plants with the minerals and nutrients necessary for life. It also keeps dead material from accumulating in the environment.

How do arthropods grow and develop?

Arthropods grow by forming new segments near the tail, or posterior, end. Unlike mollusk shells, the exoskeleton of arthropods does not grow along with the rest of the animal. As the body underneath the exoskeleton grows, the animal begins to outgrow its tough exterior.


How do ladybugs protect themselves from danger?

Ladybugs can also protect themselves by playing dead. By pulling their legs up “turtle-style”, and typically release a small amount of blood from their legs. (This is called reflex bleeding.) The bad smell and the apparent look of death usually deter predators from their small ladybug snack.

What are 5 characteristics of arthropods?

5 Characteristics of an Arthropod

Exoskeleton. Arthropods are invertebrates, which means their bodies do not have internal bones for support. Segmented Bodies. Arthropods have bodies that are internally and externally segmented. Jointed Appendages. Bilateral Symmetry. Open Circulatory System.

What two characteristics do all arthropods have?

All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages.

What are 3 of the 7 characteristics shared by all arthropods?

Characteristics shared by all arthropods include:

Exoskeletons made of chitin.Highly developed sense organs.Jointed limbs (the limbs must be jointed like the joints in a suit of armor, since the exoskeleton is rigid and cannot bend to allow movement)Segmented bodies.Ventral nervous system. Bilateral symmetry.

Do arthropods have a nervous system?

The arthropod nervous system consists of a dorsal brain and a ventral, ganglionated longitudinal nerve cord (primitively paired) from which lateral nerves extend in each segment. The system is similar to that of annelid worms, from which arthropods may have evolved.

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Do platyhelminthes have a nervous system?

Flatworms of the phylum Platyhelminthes have both a central nervous system (CNS), made up of a small “brain” and two nerve cords, and a peripheral nervous system (PNS) containing a system of nerves that extend throughout the body. The insect nervous system is more complex but also fairly decentralized.