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  1. ...sense... 1. frogs produce eggs, but cats...don't they give birth an individual kitten (not eggs obvious) 2. don't understand what do u mean of...

    分類:科學及數學 > 生物學 2009年12月18日

  2. ...they grow older. It is thought that exposure to light after birth triggers the production of melanin in the iris of the eye. By three years of age, the eyes produce and store enough melanin to have ...

    分類:科學及數學 > 生物學 2007年02月24日

  3. ... mother and kangaroo babies climb to their mother's pouch by themselves. Some animal babies can start eating solid food soon after birth . Human babies can't see properly in the first month, can...

    分類:科學及數學 > 生物學 2007年06月07日

  4. ...growth of breast tissue Prevents lactation until after the birth (with estrogen) Strengthens the mucus plug ...the pregnancy, the levels of progesterone secreted by the placenta drop off. It is this action that ...

    分類:科學及數學 > 生物學 2009年01月14日

  5. ... to come out of the mother with the head first during birth ? Ans : to prevent the umbilical cord accidentally tangling... is due to the slough off of the endometrium casued by the degeneration of corpus luteum. Without corpus luteum, no...

    分類:科學及數學 > 生物學 2008年01月18日

  6. ...that the age of a dead dolphin can be determined by observing the cross section of its teeth...quot;Color changes in growth period:" Birth : Black in color. Childhood: Grey...

    分類:科學及數學 > 生物學 2007年05月27日

  7. ...it can be determined without a doubt that an infant died prior to birth , 胎死腹中 as indicated by skin blisters, 皮膚水泡 an unusually soft head, 頭骨太軟 and an extremely offensive...

    分類:科學及數學 > 生物學 2007年10月11日

  8. ...fur and its mother's saliva. A month after birth , the color pattern of the cub’s fur is fully ...; mothers play with their cubs by rolling and wrestling with them. ...

    分類:科學及數學 > 生物學 2007年11月27日

  9. ...born, it is over 1 m (3 ft) long and able to swim. Birth takes place on the pack ice; the calf nurses...polar bear. Polar bears hunt walruses by rushing at them, trying to get the...

    分類:科學及數學 > 生物學 2006年12月01日

  10. ...mammal. mammal must have breast and nipple to let their new birth to fee their milk, taht is why we call us...have their mother to feed their babies by their own milk. But Pigeon don&#39...

    分類:科學及數學 > 生物學 2007年06月10日