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2020
發(fā)布于 2023-08-16 · 圖片1 
【科學(xué)小火車-09 卵生胎生-鴨嘴獸找朋友】
#動(dòng)物-卵生胎生。鴨嘴獸，針鼴鼠。澳大利亞。

看肥志百科擴(kuò)展的：
○鴨嘴獸沒(méi)有乳頭，乳汁是從肚子的皮膚上直接滲出，然后是由寶寶舔 著喝的。但乳汁直接暴露在空氣中，很容易接觸細(xì)菌，危害寶寶的身體。所以鴨嘴獸的乳汁會(huì)含有大量的抗菌成分，天然就可以抑制細(xì)菌滋生，保證寶寶的健康[收到]
○乳汁最早其實(shí)就是一種富含營(yíng)養(yǎng)的汗液。
○嬰兒喝媽媽的乳汁，竟然是母親的“汗”？
在某種意義上來(lái)說(shuō)，還真是。
古代的卵生哺乳動(dòng)物中，鴨嘴獸和食蟻獸的汗腺發(fā)生變化，形成了一種可以分沁營(yíng)養(yǎng)液的器官，這就是乳腺的原形。
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