why squid is mollusks? why sipver fish is arthropod? why peacock worm is annelids? why venus flower basket is porifera?
Answers
Octopuses do not have shells at all, while squids have a small internal shell. ... Cephalopods have a more developed nervous system than other mollusks. They also have very well developed eyesight that is used in finding prey.
Amazingly, Silverfish can live for months without eating. They are harmless to humans, though their presence is usually considered a nuisance. Silverfish bodies are covered with flexible and slippery scales that protect the insect from capture from larger insects such as spiders.
Peacock worm, (Sabella), any of a genus of segmented marine worms of the class Polychaeta (phylum Annelida). This type of fanworm lives in a tube about 30 to 40 centimetres (12 to 16 inches) long that is open at one end and constructed of mud particles cemented together by mucus. All but the top few centimetres of the tube is buried in the substratum. The front end of the worm has a fan of striped feathery tentacles, used for feeding and respiration, that protrudes from the tube into the overlying seawater. Inorganic and organic particles suspended in the water are trapped in mucus secreted by the tentacles. They are then transported down the tentacles by beating cilia and used either for tube building or passed into the mouth as food. Peacock worms rapidly withdraw their tentacles into the safety of the tube when predators approach. These worms are found both in the intertidal zone and in shallow subtidal areas.
The silica skeleton of the Venus' flower basket sea sponge is tough and stable because multiple levels of organization each help to manage forces. Venus' flower basket (Euplectella aspergillum) is a marine animal that lives anchored to the deep ocean floor near the Philippines.