Wane ne dabbobi masu shayarwa da kuma yadda suka sha bambam da sauran dabbobi?

Wane ne dabbobi masu shayarwa? Wannan aji ya hada da mafi m dabbobi ne gaba daya daban-daban dabbobi: wata babbar giwa da kuma kananan linzamin kwamfuta-vole, ravenous kerkẽci da tawali'u rago. Suna zaune a duk shayari: a ƙasar, a cikin tẽku (dabbobin ruwa da Whales), iska (jemagu). Amma abin da ya bambanta su daga sauran dabbobi? Dumi jini? A wannan yanayin ne muhimmi da tsuntsãye. Da ikon ya ba ta haifi rayuwa matasa? To, da farko, ba duk dabbobi ne viviparous. Wasu daga cikin su sa su qwai, kamar yadda, misali, da platypus, yayin da wasu matasa a haihuwa ne mafi kamar m tãyuna kuma dole "nunarsa" a ta musamman incubator-yar jakar a cikin uwa tasa ta ciki kamar dabbar kangaroo. Kuma abu na biyu, akwai viviparous da kuma wasu dabbobi masu rarrafe, kifi, da ko kwari. A cikin tambaya na wanda da dabbobi masu shayarwa fiye da suka bambanta daga kifi, amsar mai sauki ne: gaban haske. All dabbobi miciwa. Saboda haka, shark ba ya bukatar ya tashi zuwa surface numfashi, sabanin kamar ta bayyanar da dabbar dolfin, wanda zai iya kawai nutsar ba tare da bada rai-oxygen. Amma, sake, da huhu da yawa m halittar dabba mai kafafuwa, da kuma duk da tsuntsãye.

Daga cikin bambance-bambance babbar dabbobi kawai biyu sigogi za a iya gano cewa ayyana wanda da dabbobi masu shayarwa. Shi ne gaban gashi da kuma ciyar da 'yan maruƙa madara. All mãtã wannan kungiyoyin dabbobi ne a jiki na mammary gland, wanda suna cike da sinadarin gina jiki ruwa bayan haihuwa. Wannan dukiyar da ya ba da sunan duk dabbobi masu shayarwa. Daga cikin sauran siffofin da cewa faye hali da dabbobi, za ka iya ƙara gaban ƙananan muƙamuƙi, kunsha na daya kashi, da kuma diaphragm da ya raba cikin huhu da zuciya daga narkewa kamar fili.

Amma mafi muhimmanci alama a kayyade wa da dabbobi masu shayarwa ne su wuce yarda da kwakwalwa da kuma m tsarin hali. Wannan yana nufin cewa mutane biyu daga cikin guda jinsunan, sau daya a cikin wannan hali a rayuwa iya nuna hali daban. Sun iya yin amfani da kwarewa, don tsayar da su yi hankali. Ba abin mamaki cewa a cikin aji na dabbobi masu shayarwa bayyana ra'ayi na Homo sapiens - Homo sapiens. To, sai dai shi a Duniya zaune for game da 5000 jinsunan sauran dabbobi, wanda aka harhada Systematics 1,100 danginsu, 140 iyalai da kuma 18 umarni da kuma 3 iyalansu.

Babu kasa ban sha'awa ne da wata gabar jiki na dabbobi masu shayarwa. Domin duk su bayyana bambancin (da yara kusoshi, yatsunsu da mutum birai, kofato), su duka ƙarasa da wani jaraba appendage - wani farce. A dabbobi da cewa rayuwa a cikin ruwa, wadannan matakai za su atrophy. Wannan yanayin ne ya daidaita da muhalli da yanayi da gudummawar da cewa dabbobi masu shayarwa sun yada a duk faɗin duniya da kuma sun riƙi dukkan rayuwa ta alkuki - a kan ƙasar, a cikin iska, a cikin tẽku, a karkashin kasa. Saboda da ikon ya kula da yanayin jiki na dumin jiki, ba za su iya rayuwa a cikin Arctic (iyakacin duniya take ɗauke) da kuma wurare masu zafi (jerboa, da raƙuma) Hamada.

The tambaya: idan akwai farko da dabbobi? Babu shakka cewa mafi tsufa dabbobi masu shayarwa samu cikin shekaru na dinosaur. Sa'an nan sũ, sun kasance yafi kananan a jiki, da kuma nuna alamun "dabba-kamar dabbobi masu rarrafe." Kamar yadda masana kimiyya aiki tare da burbushin, da a kawo musu kayan kawai skeletons, yana da wuya a tantance a abin da mataki a cikin wadannan dabbobi bayyana ulu da ikon ciyar da 'yan maruƙa madara. Idan muka fara daga qa'idar edinokostnoy kashin dadashinsu, za mu iya amince ce cewa ko da 215 miliyan shekaru da suka wuce a Afrika ta Kudu, Turai da kuma China sanaki a kananan (15 cm), kuma wata dabba mai kama da wani zamani shrew.