The first paper was made from the bark of the mulberry tree.
A、driedwoodB
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Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
Foodmustbemoistinordertohaveataste.
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.
