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20 answers for: Earth's oldest living ecosystems
RANKANSWERCLUE
RAINFORESTSEarth's oldest living ecosystems
RAINFORESTEarth's oldest form of ecosystem
CRATEREarth's oldest asteroid ___ was found in Australia (6)
BORISSPASSKYThe oldest living former world chess champion
CARTEROldest living U.S. president
TREEBEARDOldest living thing in Middle Earth
EVA___ Marie Saint (oldest living winner of an Oscar)
SPASSKYChess grandmaster who is the oldest living former world champion (7)
VASANTRAIJIIndia's oldest living first-class cricketer is a centurion. (6,5)
BARBSharp comment or fish hook part (or what close friends might call our oldest living First Lady)
PINE"Letter to the Person Who Carved His Initials Into the Oldest Living Longleaf ___ in North America" (Matthew Olzmann poem)
DUCHESSOFKENTTitle currently held by Katharine, the oldest living member of the British Royal Family (7,2,4)
TIGRESSOldest living big cat in Ranthambore breaking breeding age records. (7)
MAJORWho is the oldest living former UK prime minister? (5)
CRETEIsland home of what may be the world's oldest living olive tree (2,000+ years)
COMPLEXESEcosystems
COMPOSITESEcosystems
FAUNASParts of ecosystems
BIOMESLarge ecosystems
REEFSSome endangered ecosystems