UMary Allen
Amaqanda akhiwa kwizibeleko zoomama abaninzi bezilwanyana. Ngaphakathi kweqanda kukho iseli encinane yeqanda. Oku kubangela ukuba isilwanyana sikhule xa inkunzi isichumisile. Amaqanda afumaneka kwiintaka nakwizilo ezirhubuluzayo, ezazifudula zikwiidinosaurs. Iintlanzi zikwabeka amaqanda, kunye ne-arthropods, okt izinambuzane, i-centipedes, oononkala kunye nee-arachnids, kunye nezinye iindidi zezilwanyana.
Iqanda liquka iseli encinane yentsholongwane. Le yiseli nje enye engenakubonwa ngeliso lenyama. Ngaphakathi kwayo kukho ukutya okufunwa lisilwanyana esincinci de siqandusele. Ngaphandle lulusu. Amaqanda anjalo athambile njengerabha, njengamaqanda ofudo. Amaqanda entaka aseneqokobhe eliqinileyo lekalika elijikeleze ulusu.
Amalungu eqanda lesikhukukazi aqhawuke avuleka kulula ukuwaqonda: indawo emthubi, umthubi, ingaphakathi. Ngamanye amaxesha ikwabizwa ngokuba yi "yolk". I-yolk isongelwe kwisikhumba esincinci, esicacileyo, esifana nelekese. Olu lusu lujijelwe kunye ngaphandle kwaye ludityaniswe kwiqokobhe leqanda. Ngaloo ndlela i-yolk ayishukumi kakhulu. Umthubi udada kwiqanda elimhlophe. Ngamanye amaxesha oku kubizwa ngokuba yi "protein". Kodwa oko akucaci kuba iprotheni yinto eyenzeka nasenyameni, umzekelo.
Kwisikhumba se-yolk, unokubona ngokucacileyo idiski yentsholongwane emhlophe. Kusenokufuneka ujike i-yolk ngononophelo. Intshontsho likhula kwi-embryonic disc. Umthubi kunye neqanda elimhlophe kukutya kwayo de iqandusele.
Oomama bezilwanyana babeka amaqanda abo xa sele bekhulile. Ezinye izilwanyana zifukamela amaqanda azo kwindlwane njengoko inkoliso yeentaka zisenjenjalo. Umama udla ngokuwafukamela amaqanda, maxa wambi etshintshana noyise. Ezinye izilwanyana zibeka amaqanda ndaweni ithile zize ziwashiye. Ngokomzekelo, ufudo lungcwaba amaqanda alo esantini. Ilanga ke linika ubushushu obuyimfuneko.
Izilwanyana ezanyisayo azinawo amaqanda. Zineqanda elinye kuphela okanye iseli yentsholongwane. Yiseli enye, encinci kwaye ayibonakali ngeliso lenyama. Kwabasetyhini, iqanda livuthwa malunga kanye ngenyanga. Ukuba uye walala nendoda ngeli xesha, umntwana usenokukhula. Usana lutya ukutya okusegazini likanina.
Yintoni amaqanda atyiwa ngabantu?
Uninzi lwamaqanda esiwatyayo aphuma kwiinkukhu. Amanye amaqanda entaka, umzekelo, asuka kumadada. Ngokuqhelekileyo ezi ntaka zihlala kwiifama ezinkulu, apho zinendawo encinane kwaye azikwazi ukuphuma ngaphandle. Amantshontsho angamadoda abulawa ngoko nangoko kuba awanakubekela amaqanda. Iivegans zicinga ukuba kubi kwaye ke ungawatyi amaqanda.
Abanye abantu bayawathanda amaqanda entlanzi. Eyona nto iyaziwa kakhulu ibizwa ngokuba yi-caviar kwaye ivela kwi-sturgeon. Ukuze uqokelele la maqanda, umntu kufuneka avule i-sturgeon. Yiyo loo nto i-caviar ibiza kakhulu.
Umzekelo, abantu batya amaqanda abilisiwe kwisidlo sakusasa. Epanini, wenza amaqanda aqhekekileyo okanye amaqanda aqhotsiweyo. Nangona kunjalo, sihlala sidla amaqanda ngaphandle kokuwabona: kwiifektri ezinkulu, i-yolk yeqanda kunye ne-albhamuen zicutshungulwa ukuba zitye.