'Many XXX of creatures are becoming extinct, or are suffering steep decline in numbers. The diver-sity of XXX is necessary for the functioning of ecosystems, and in some cases endangered XXX contribute to the human food chain (eg honey bees)...'
The word which fits best is 'species'.
Karan
2 days agoStephen
15 days agoVallie
20 days agoGiovanna
2 days agoCarey
23 days agoLaurene
25 days ago