0
Echinoderms
Echinoderms are marine animals with radial symmetry. Some types of echinoderms are sea stars, sea urchins, sand dollars, and sea cucumbers.
294 Questions
Why are echinoderms considered as a regressive of animals?
Echinoderms are often considered regressive animals due to their unique evolutionary traits, such as their radial symmetry and a lack of centralized nervous systems, which contrast with the bilateral symmetry and more complex nervous systems seen in many other animal groups. Their larval forms are typically bilaterally symmetrical, but they undergo a metamorphosis that results in the adult form being radially symmetrical, suggesting a simplification in structure. Additionally, their reliance on water vascular systems for movement and feeding further illustrates a departure from more complex systems found in other phyla.
What are the 3 types of echinoderms?
Echinoderms are a phylum of marine animals. I dont know what is ment by 'the three types' as there are 5 living classes : Crinoidea (Sea lilies), Asteroidea (starfish), Ophiuroidea (brittle stars ), Echinoidea (sea urchins and sand dollars) and Holothuroidea (sea cucumbers). The most commonly observed being Asteroidea, Echinodea and Holothuroide as Crinoidea are generally benthic sessile creatures and most Ophiuroidea are benthic and photophobic so even the littoral ones are rarely seen during the day,
In a starfish, the ambulacral ossicles are little calcified bony plates covering the radial canal.
Echinoderms are sea animals that live in salt water. There are five kind of Echinoderms, sea stars, brittle stars, sea cucumbers, sea urchins, and sand dollars. Echinoderms all are invertebrates and have internal skeletons.
What physical process is responsible for gas exchange and excretion in all echinoderms?
In echinoderms, gas exchange and excretion primarily occur through a process called diffusion across the tube feet and body surface. These organisms possess a water vascular system that enhances the efficiency of this process by facilitating the movement of water and gases. Oxygen diffuses into the body while carbon dioxide and waste products diffuse out, allowing for effective respiration and excretion. Additionally, specialized structures like papulae (skin gills) also play a crucial role in these processes.
Do most echinoderms have highly developed sense organs?
No, they have them, but they're relatively basic.
YES, but it is not the same "ossicles" that are found in the mammal ear.
Echinoderm ossicles are small calcium-matrix plates that make up the dermis or endoskeleton of the echinoderm. They provide protection and support to the underlying tissue.
Do echinoderms have a cell wall?
No, echinoderms are a type of marine animal. Animal cells do not have cell walls, only cell membranes.
What kingdom is the inflated sea biscuit?
Sea biscuits are related to sand dollars. Both are echinoderms and are related to starfish, sea cucumbers, sea lilies sea urchins and brittle stars.
Which feature would you find on an echinoderm-?
novanet: an endoskeleton you cheaters get back to work
No not all Echinoderms have backbones like the starfish
Are echinoderms heterotrophs or autotrophs?
Echinoderms, like all animals, are heterotrophs and need to eat food to survive.
