Mary Allen
Mollusks rukuni ne na dabbobi. Ba su da kwarangwal na ciki, ma'ana babu kashi. Kyakkyawan misali shine squid. Wasu mollusks suna da harsashi mai wuya kamar kwarangwal na waje, kamar mussels ko wasu katantanwa.
Yawancin nau'ikan suna rayuwa a cikin teku. Amma kuma ana samun su a cikin tafkuna da koguna. Ruwan yana taimaka musu ɗaukar jiki. Sannan bashi da nauyi. Ƙananan nau'i ne kawai ke rayuwa a ƙasa, kamar wasu katantanwa.
Mollusks kuma ana kiran su "mollusks". Wannan ya fito daga kalmar Latin don "laushi". A ilmin halitta, mollusks suna samar da nasu kabilar, kamar yadda vertebrates ko arthropods suke. Yana da matukar wahala a ƙidaya nau'ikan mollusks nawa ne. Wasu masana kimiyya suna kiran 100,000, wasu kuma ƙasa. Wannan saboda yana da wuya a bambance tsakanin nau'ikan iri daban-daban. Don kwatantawa: Akwai kuma kusan 100,000 kasusuwa, yayin da kwari yana iya yiwuwa miliyan da yawa.
Menene mollusks suke da su?
Mollusks suna da sassan jiki guda uku: kai, ƙafa, da buhu mai ɗauke da hanji. Sai dai kuma kai da kafa wani lokaci suna zama kamar an yi su ne da guntu guda, misali a wajen katantanwa. Wani lokaci ana ƙara harsashi a matsayin kashi na huɗu, kamar yadda yake tare da mussels.
Duk mollusks banda mussels suna da wani harshe mai raɗaɗi a kawunansu. Yana da m azaman fayil. Dabbobin suna zubar da abinci da shi saboda ba su da haƙora.
Duk mollusks suna da tsoka mai karfi da ake kira "ƙafa". An fi gani a cikin katantanwa. Kuna iya amfani da shi don motsawa ko binnewa.
Hanjin yana kwance a cikin jakar visceral. Wannan wani bangare ne na jiki wanda ke kewaye da riga. Yana dauke da esophagus, ciki, da hanji. Akwai saukin zuciya. Duk da haka, wannan ba ya zubar da jini ta cikin jiki, sai dai wani ruwa mai kama da shi, hemolymph. Suna cewa "hemolums". A mafi yawan mollusks, yana fitowa daga gills, inda suke sha oxygen. Katantanwa ne kawai waɗanda ke zaune a ƙasa suna da huhu. Zuciya tana fitar da hemolymph cikin jiki.