Ecology: The Delicate Balance of Life on Earth

Ecology: The Delicate Balance of Life on Earth — page 9
Economy THE DELICA BALANCE OF LIFE ON EART the complex interactions and interdependen cies of living things and their environments EARLY STUDIES OF THE NATURAL WoRLD Long before the science of ecology was estab lished people in many occupations were aware of natural events and interactions A gaggle of geese migrating south is a natural harbinger of impending winter Shutterstock com 14