Related Clues:

• Biological community with its environment
• English firm has technique for orderly collection of organisms
• European comfortable with check in integrated community
• Way that's green first for self-contained community!
• Biological set-up could be destroyed by comets, yes?
• Self-contained community of plants and animals and their physical environment
• Unit consisting of a community of organisms and their environment
• Environmentalist's study
• A green sphere?
• Coral reef, e.g
• The interaction of organisms with their physical environment
• English officer network for community in the wild
• Ultimately nice and comfortable bit of shrub for biological set-up
• Biosphere component
• “People are dying. Entire ____s are collapsing.” (Greta Thunberg, 2019)