Trees are earth's largest organisms and are also one of the planet's oldest inhabitants.

树木是地球最大的制氧机器，也是这个星球上最古老的居民。

youdao

Corals are anthozoans, the largest class of organisms in the cnidaria group.

VOA: special.2010.08.10

The dispersant that has been used in the largest amounts on this spill, Corexit 9500, is among the most toxic to certain organisms of all those approved by the Environmental Protection Agency for use in oil spills, according to EPA tests.

WSJ: Gauging Harm to Ecosystem Could Take Years