The first paper was made from the bark of the mulberry tree.
B
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Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
Theflowerbudofawaterlily百合opensatsunsetsince.itsopeningistriggered(commence).bythedecreasedlight.
TheeconomyofDallas,Texas,isstronganddiversified.
Blue－greenalgaegrowabundantlyinsaltmarshes.
Eyespots, the most rudimentary eyes, are found in protozoan原生动物 flagellates 鞭毛虫 , flatworms 扁形虫 , and segmented worms片段 蠕虫 .