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So why the change in theory? One idea just actually comes from looking at those teeth. They' re actually designed for crunching through bone, but if we compare that with another meateating dinosaur tooth, a dinosaur called Megalosaurus. And this is much more like an actual steak knife, whereas these things are like railroad spikes. This suggests that the T Rex was actually a specialist bone crushing dinosaur, so maybe it was bone crushing because it was hunting. They might have just been bone crushing because it was eating carcasses. What about the arms that those pathetic little front arms? Are they giving any clues? They' re obviously not there for feeding, ' cause they couldn' t even reach the mouth of the animal. The best idea we have for these to the arms is either there' s something called a vestigial structure. That is a structure that' s been is kind of disappearing through evolution. So they' re on their way out? Exactly. Or maybe they' re something to do with mating, and actually they' re used for holding on. |
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nà me wèi shí me lǐ lùn huì biàn huà? shì yīn wèi duì zhèi xiē yá chǐ de guān chá, tā men běn gāi yòng lái jué suì gú tou. dàn rú guǒ wǒ men bǎ zhèi xiē yá chǐ. bān lóng, yòu míng jù lóng. jù chǐ lóng shēng yú zhū luó jì wǎn qī, hé lìng yī zhǒng shí ròu lóng, bān lóng de yá chǐ bǐ jiào, bān lóng chǐ gēng xiàng shì niú pái dāo. ér zhèi xiē zé xiàng shì tiě lù dào dīng, zhè shuō míng bà wáng lóng dà gài zhǐ shàn cháng yǎo suì gú tou. zhè yǒu kě néng shì wèi le bǔ shí huó wù, dàn yě kě néng shì wèi yǎo suì shī tǐ. tā duǎn dé kě lián de qián zhī ne? néng shuō míng shén me ma? bà wáng lóng qián zhī bú shì yòng lái bǔ shí de, tā men gòu bú dào bà wáng lóng zì jǐ de zuǐ bā. zuì yǒu kě néng de liǎng zhǒng jiě shì shì, yào me tā shì mǒu zhǒng cán yú jié gòu, zhèng zài jìn huà guò chéng zhōng zhú jiàn xiāo shī, jiù shì shuō qián zhī zài tuì huà ma? shì de, yào me jiù shì yòng lái bāng zhù bà wáng lóng jiāo pèi, yòng lái zhuā zhù jiāo pèi duì xiàng. |