Where ulu mammalian embryo? ka oi aku mammals

Mammals (7 papa e këia keia kumuhana i loko o ka māhele o Zoology) hui pu iho la i na holoholona i hānai kā lākou mau keiki i ka waiū. No keia mea no ka nui loa papa o vertebrates, loaʻa nō kekahi mau Mea Maluna loko o kēia kahua hoʻonohonohoʻana ke kuʻikahi. Kekahi o ia ua muli ma luna o kahi o ka mammalian embryo e hoʻomōhala ai. Keia ninau e noonoo mākou i loko o au mamuli o keia Haawina.

mammalian? ueo

All mammals i dioecious kiekie holoholona. A me na wahine, a me kane ua hui kaulua gonads: na ovaries a me testes, kekahi me kekahi. Ka mea, e wehe i waho hana kūikawā kaha. No kēia mau holoholona a pau i ano wale no na fertilization. Eia naʻe, mai kahi o ka ulu mammalian embryo hilinaʻi nui ma luna o ke kahua a me kona hou? Acaeoey pae.

ʻO wai nā yinotheria

Malihini akā, oiaio: ma laila nā mammals i kau hua. Ka mea, i kapaʻia "yinotheria" a me ka hana hoʻokahi wale nō pa alima - monotremes. Aʻo ia ka inoa no laila, no ka mea, i kēia mau holoholona i ka cloaca. He He primitive kāna moʻolelo, ano o ka mua chordates. Ke cloaca He He hookahi puka i loko i nā huahana i hanohano, e loaa hou urinary, digestive a me reproductive nenoai.

Yinotheria loa poe uuku ma ka helu, nā wale 6? Ueo. Lākou mau habitats - Australia me ka mea e pili mokupuni. Lākou mau elele i na echidnas, platypus a me nāʻano likeʻole o ka spiny anteaters. Ka mea, e mai i nipples a me ka waiu ma na ducts o na glands ua hookuu ana i ka ili o ka ili. Ka i kailiia aku i e palu ia, e, e hoomaonaia oukou.

Muli o kona kulana uncommon o keʻano o kēia mau holoholona. Echidna ka mea i like loa me ka hedgehog nui. Kona lōʻihi aʻoi paipu mea,ʻaʻole i kekahi mea, aka, o ka hooponopono hou o ka lauoho, he pono ole i na mea a pau mammals. Aia ma lalo ia o ka papa o ke anuanu kapakomo. A i ka wa e noonoo i ka mea i ua elongated ka mua loa o ka waha o loko o ka proboscis a me na lala, Ua lena manamana o papahana no kaʻeliʻana, echidna, a 'aʻole maopopo fantastic nonexistent holoholona. Lākou wahine hanau he hookahi hua. Ka mea, pono e hoola mai ia i loko o ka loko o ka ili aia ma kaʻaoʻao ventral o ke kino.

Platypus nana heʻokoʻa. Ma kona inoa kokoke oluolu, e koho i ka mea i loaa i ke akea a me ka ihu. Ma nā manamana lima hooponopono o 'Amelikaʻili lahilahi, a me ka huelo i ka flattened kinona, e hana e like flippers. Platypus hoʻomoe lākou mau hua i loko o ka lewa, a hoopii ia lakou iho.

Mau holoholona Subclass

O kēia mau holoholona i loko o na mea i ka mea, e hanau e noho ui, hoʻokahi houʻana,ʻaʻole e hoʻomoe iā lākou, e like na manu. Ka mea, i ole cloaca, a me na ducts o ka digestive, reproductive a me ka urinary nenoai wehe i hoʻokaʻawale, hana kūikawā awa. Kaumaha ma muli o kahi o ka mammalian embryo e hoʻomōhala ai, maopopo marsupials a me placental mammals.

Marsupial paukū

Ua mea i typical poʻe e noho lā ma ka'Aukekulelia'āinapuniʻole. Ka mea, i wehewehe aku e ka mea ia ia wahi ma ka ulu mammalian embryo (hua manu), ka mea, haʻalele loa koke. Keia mea, no ka mea, ua pau loa ia nalowale ke keiki. E like me ka hopena, i ka opiopio e hanauʻiliahi, uuku nui, aʻaʻole hiki ke kuokoa ola. i ka hanau ana o kekahi manawa ka mea, i loko o kaʻekeʻili ma hope, i waiho ia ma kaʻaoʻao ventral o ke kino. Ua wehe a me ducts o ka mammary glands.

A keiki kamaiki mea ai nawaliwali a me ka palupalu iho ia i ka mua manawa hiki a hiki ole waiu ma luna o lākou iho. Nāʻiʻo glands spontaneously hoemi a koho spurting wela waiū i loko o ka waha o ka liʻiliʻi marsupial holoholona. Me ka Poeikohoia o kēia mau holoholona i kuhikuhi kangaroo. e hiki ke hoʻoneʻe i ka mämä holo o ma kahi o 60 km / h lakou.

'Ano, he pono ole ma ka Australia o ka marsupial bea koalas a me possums.

Placental kahi o ka mammalian embryo e hoʻomōhala ana i

Ka mea nui e ulu ai, a pela i palahalaha ae ma ka Honua, i mammals, a me ka uterus, a ua hua mai i hāpai keiki ke keiki. Ka mea, e hoopaa ana i ka makuahine a me ka bebe i ka hāpai keiki. Ma hope o ka ho okumu ana o na moku koko ua hana ka hanu a me ka hoonohonoho hou nutrient. E like me ka hopena, i ka wā e hiki mai kino ua hoomakaukau ia me nā mea a pau nui kumu a me ka rula, a me ka uterine paia ua palekana mai adverse? Aneie ana. Ia ia keia ikaika lawa ia e koke ma hope o ka hanau ana o kekahi viable, a ma hope o ka pōkole manawa e hele ai i ka aupuni kūʻokoʻa ka'āina. Pehea e holumua ai kēia moʻolelo ka, wahi a ka helu a me kaʻoihana o ka Hoʻohaku holoholona o ia kino. Insectivores, opeapea, rodents, Lagomorphs, Artiodactyla a me na lio, carnivores, pinnipeds - kēia mea,ʻaʻole he i ka papa inoa o nā huahelu i mea placental. Ae, a me primates, i loaʻa ke kālā no Look Homo sapiens, i kona ulu i ke aloha a hiki i ke alo o kēia hiʻona like luawai.

No mammals: i ka pono a me ka keakea

O ke ala, kūpono 'ana o ke embryo i loko o ka uterus Via ke keiki o ka loa hemolele ala. Ma kona ho okumu uterine paia a me ka blastoderm paa i fused. Ke keiki a pau ka waiwai i ka mea i loko o ke kino o ka makuahine, o ka e kaʻi aku i loko o ke kino o ke keiki. Ma ka'ōpū ia i ua i makau i kekahi wela loli, aole hoi ka poe hookaha. Maoli ai, oviparous mea i loko o ka emi mai maikaʻi kūlana. Kēia mea he maopopo mea. O ka holo ana, hua iloko ona nui dala o ka mahuaola e pono ai no ka hooulu ana o ka embryo. Akā, ka mea i lilo i makemakeia waiwai pio o predatory holoholona. Kona hoomaopopo ana i ka i kā mākou helu o nā hua 3-4, hiki nui e waiho ole keiki kakou nana. Young marsupials i hanau oi underdeveloped. No ka laʻana, ka lōʻihi like 'ole o ka hāpai keiki kaʻina hana ma ka possum māhunehune mau pule. Maoli ai, i loko o ia he pōkole wā o ka manawa ia o ka luna 'kino' aʻole ole i manawa e hiki aku i ka pono kahua o ka? Acaeoey.

Ke'ōlelo mai, no ka hooulu ana o mammals mai hiʻona e ae e hui pu iho la ia i loko o ekolu pūʻulu, kela mea keia mea o ka a i kona mau ka hoʻololiʻana hiʻona: monotremes, marsupials a me placental.