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3. Earth Day subject: Abbr

Alternative clues for the word ecol

• Global warming subj.
• Study of organisms and their habitats (abbr.)
• Subj. concerned with bioregions
• Branch of biology: Abbr
• Green study subj
• Forester's concern: Abbr.
• Conservation subj
• Biology branch: Abbr.
• Branch of biol.
• Earth science (Abbr.)