Answer: Explanation: Classes of hollow-bodied animals includes jellyfish, hydra, sea anemones and coral .
Are hollow-bodied animals that have stinging cells?
Nearly all (about 99 percent) cnidarians are marine species. Cnidarians contain specialized cells known as cnidocytes (“stinging cells”), which contain organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, serving to immobilize prey with toxins contained within the cells.
Is jellyfish hollow body?
The main feature of a true jellyfish is the umbrella-shaped bell. This is a hollow structure consisting of a mass of transparent jelly-like matter known as mesoglea, which forms the hydrostatic skeleton of the animal.
Which invertebrates have hollow tubes with many pores?
In addition to the osculum, sponges have multiple pores called ostia on their bodies that allow water to enter the sponge. In some sponges, ostia are formed by porocytes: single, tube-shaped cells that act as valves to regulate the flow of water into the spongocoel.
What are hollow-bodied or soft-bodied animals?
Soft-bodied organisms are animals that lack skeletons . The group roughly corresponds to the group Vermes as proposed by Carl von Linné. All animals have muscles but, since muscles can only pull, never push, a number of animals have developed hard parts that the muscles can pull on, commonly called skeletons.
Can jellyfish feel pain?
They don’t have any blood so they don’t need a heart to pump it. And they respond to the changes in their environment around them using signals from a nerve net just below their epidermis – the outer layer of skin – that is sensitive to touch, so they don’t need a brain to process complex thoughts.
Are jellyfish immortal?
The ‘immortal’ jellyfish, Turritopsis dohrnii
To date, there’s only one species that has been called ‘biologically immortal’: the jellyfish Turritopsis dohrnii. These small, transparent animals hang out in oceans around the world and can turn back time by reverting to an earlier stage of their life cycle.
What are soft bodied animals called?
Invertebrates are generally soft-bodied animals that lack a rigid internal skeleton for the attachment of muscles but often possess a hard outer skeleton (as in most mollusks, crustaceans, and insects) that serves, as well, for body protection.
Do Coelenterates have blood?
Coelenterates have no blood or central nervous system. However, they do have nerve cells scattered in the jelly between the cell layers.
Is an oyster a hollow-bodied animals?
The letter of answer is B-oyster. Corals, jellyfish, and sea anemones are hollow-bodied animals. ... Oysters are hermaphrodites and some have alternates sexes seasonally or with changes in water temperature.
What are the 9 animal phyla?
There are 36 recognized animal phyla, of which but nine ( Mollusca, Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Echinodermata, and Chordata ) contain the vast majority of described, extant species.
What are the 3 types of sponges?
Most sponges fall into one of three categories, based on their canal systems – asconoid, syconoid and leuconoid .
Which are the simplest animals with true tissues?
The cnidarians, or the jellyfish and their kin , are the simplest animal group that displays true tissues, although they possess only two tissue layers.
Which animal have no bones?
Animals without backbones are called invertebrates . They range from well known animals such as jellyfish, corals, slugs, snails, mussels, octopuses, crabs, shrimps, spiders, butterflies and beetles to much less well known animals such as flatworms, tapeworms, siphunculids, sea-mats and ticks.
Which class animal has soft legs?
The mollusca shell shelters the soft parts of an body. Mostly living on the land, freshwater and also in sea. Mollusca has a muscular foot and it has pair of statocysts which act as a balance sensors.
What is an animal without skeleton called?
Learn More. About Invertebrates . Invertebrates are animals without a backbone or bony skeleton.
