crucial ⪢⪢
http://qindex.info/i.php?x=13426
 crucial ⪢⪢
http://qindex.info/i.php?x=19720
○○○ keystone species ⪢⪢
Beavers are keystone species wielding an oversized influence on their surroundings. They build dams which filter water, flood rivers and create crucial wetlands.
http://qindex.info/i.php?x=14911
○○○ essential ⪢⪢
crucial, critical, vital, integral, indispensable
http://qindex.info/i.php?x=17995
○○○ critical ⪢⪢
crucial
http://qindex.info/i.php?x=21373
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