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樓主 / 宜過過過過過
- 時間: 2019-12-19 11:59www.sciencedaily.com/r...142424.htm 一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一
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第 2 樓 / Slowking
- 時間: 2021-2-02 14:06As a baby animal grows and develops inside the womb, its bones and teeth do, too. The researchers examined the degree of ossification, or how much the skeleton has formed by the time of birth. They looked at whether the teeth had started to calcify or erupt, and the degree of fusion between the bony plates that make up the skull.
The panda may be an extreme example, but all bears have disproportionately small babies, Li said. A newborn polar bear's birthweight as a fraction of mom's is less than 1:400, or less than one-half of one percent of her body mass. For the vast majority of baby mammals, including humans, the average is closer to 1:26. -
Why Are Giant Pandas Born So Tiny?
