TY - BOOK AU - Bright,Michael TI - Changing ecosystems T2 - Timeline : life on Earth SN - 9780431064697 (hbk.) : U1 - 577.2 22 PY - 2009/// CY - Oxford PB - Heinemann Library KW - Biotic communities KW - Juvenile literature KW - Ecological disturbances KW - Nature KW - Effect of human beings on N1 - Formerly CIP; Includes bibliographical references and index ER -