Mary Allen
Moluska ndi gulu la nyama. Alibe mafupa amkati, kutanthauza kuti alibe mafupa. Chitsanzo chabwino ndi nyamayi. Nkhono zina zimakhala ndi chigoba cholimba monga zigoba zawo zakunja, monga nkhono kapena nkhono zina.
Mitundu yambiri imakhala m'nyanja. Koma amapezekanso m’nyanja ndi m’mitsinje. Madzi amawathandiza kunyamula thupi. Ndiye alibe kulemera. Ndi mitundu yaing’ono yokha yomwe imakhala pamtunda, monga nkhono zinazake.
Ma mollusks amatchedwanso "mollusks". Izi zimachokera ku liwu lachilatini loti "zofewa". Mu biology, nkhonozi zimapanga fuko lawo, monga momwe zimachitira zamoyo zam'mimba kapena arthropods. Ndizovuta kwambiri kuwerengera mitundu ingati ya mollusks yomwe ilipo. Asayansi ena amatcha 100,000, ena ochepera. Izi zili choncho chifukwa zimakhala zovuta kusiyanitsa mitundu yosiyanasiyana. Poyerekeza: Palinso amoyo pafupifupi 100,000, pomwe tizilombo mwina ndi mamiliyoni angapo.
Kodi mollusks amafanana bwanji?
Nsomba zili ndi ziwalo zitatu za thupi: mutu, phazi, ndi thumba lomwe lili ndi matumbo. Komabe, mutu ndi phazi nthawi zina zimawoneka ngati zapangidwa ndi chidutswa chimodzi, mwachitsanzo pa nkhono. Nthawi zina chipolopolo chimawonjezeredwa ngati gawo lachinayi, monga momwe zimakhalira ndi nkhono.
Nkhono zonse kupatula nkhono zili ndi lilime lophwanyika pamutu pawo. Ndizovuta ngati fayilo. Nyamazo zimapera nazo chakudya chifukwa zilibe mano.
Nkhono zonse zimakhala ndi minofu yolimba yotchedwa "phazi". Zimawoneka bwino mu nkhono. Mutha kugwiritsa ntchito kusuntha kapena kuboola.
Matumbo ali m'thumba la visceral. Ichi ndi gawo losiyana la thupi lomwe lazunguliridwa ndi malaya. Lili ndi mmero, mimba, ndi matumbo. Pali mtima wosavuta. Komabe, izi sizimapopa magazi m'thupi, koma madzi ofanana, hemolymph. Iwo amati "hemolums". M'magulu ambiri a mollusks, amachokera m'matumbo, momwe amayamwa mpweya. Ndi nkhono zokha zomwe zimakhala pamtunda zomwe zimakhala ndi mapapo. Mtima umapopa hemolymph m'thupi.