Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.
A、asaresultofInthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Insectpestsareamongtheleadingcausesofcropfailure.
