Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.