1 He has actual professional qualifications in ecology and conservation.
2 Fossils preserved in sedimentary rocks will display that era's primary forms, reflective of that era's ecology and life's adaptations to best exploit it.
3 Social systems evolve in close relation to ecology.
4 Each animal has its ecological niche.
5 Various ecological issues have come to the fore since the discovery of the hole in the Earth's ozone layer.
6 The Black Sea is facing ecological catastrophe as a result of pollution.
7 The Global Communications Group links ecological and other political activists via the Net.
8 The ecological disaster is partly a product of letting everything rip in order to increase production.
9 Spanish authorities have prevented a major ecological disaster by diverting a flow of toxic spill away from one of Europe's leading national parks.