What do cnidarians and echinoderms have in common?
The main similarity between echinoderms and cnidarians is that they are aquatic animals.
What is similar about echinoderms and cnidarians In what way does symmetry differ between these two groups?
What is similar about echinoderms and cnidarians? In what way does echinoderm symmetry differ from that of cnidarians? Cnidarians and echinoderms have radial symmetry; mollusks have bilateral symmetry. Cnidarians have no body cavity or cephalization; mollusks and echinoderms have a true coelom and cephalization.
Which of the following is a trait of cnidarians?
Cnidarians share several basic characteristics. All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea.
Which of the following characteristics is exhibited by the water vascular system of echinoderms?
The water vascular system of echinoderms is essentially a system of fluid-filled canals that extend along each of the body regions and have many external projections called tube feet. There are several functions of the system, one of which is to use water pressure to mediate movement and assist in feeding.
What are the unique characteristics of echinoderms?
Characteristics of Echinodermata
- They have a star-like appearance and are spherical or elongated.
- They are exclusively marine animals.
- The organisms are spiny-skinned.
- They exhibit organ level of organization.
- They are triploblastic and have a coelomic cavity.
- The skeleton is made up of calcium carbonate.
What organisms are echinoderms?
Echinoderms are invertebrate marine organisms that have a hard and spiny skin or covering. Examples of echinoderms are sea urchins, sea lilies, sea cucumbers, feather stars and sea stars (starfishes).
Does echinoderms have heart?
Echinoderms have a unique water vascular system. The echinoderms have an open circulatory system, meaning that fluid moves freely in the body cavity. But echinoderms have no heart.
Do sand dollars have genders?
Dollar babies: Sand dollars have separate genders and are usually either male or female. They practice external fertilisation, releasing eggs and sperm simultaneously into the water. Sand dollars undergo metamorphosis and their larvae look nothing like their adults.
What is inside a sand dollar?
This shell is called a test and is the endoskeleton of a sand dollar, a burrowing sea urchin. The shell is left behind when the sand dollar dies and its velvety spines fall off to reveal a smooth case underneath. A sand dollar’s body has five jaw sections, 50 calcified skeletal elements, and 60 muscles.