1. The debate whether a virus is living or nonliving leads nowhere. ���۲����������廹�Ƿ���������ͽ������ġ�
2. A coating or covering on the surface of a living or nonliving substrate composed of organisms like bacteria, protozoa and algae. �����ԭ�����������������������������֮���㸲���
3. The environment is everything around us. It includes all of the living and the nonliving things (air, water, and energy) with which we interact. ������һ�������Ǹ�������������������������������ˮ������������