All life needs sunlight to live on. But only plants can use sunlight directly. Plants are "factories". They make food from sunlight, water and things in the soil and air.Plants feed all other living things. Animals can only use the sun's energy (能量) after it has been changed into food by plants. Some animals' feed directly on plants, others eat smaller animals. Meat-eating animals are only eating plants indirectly.What about human beings? We are members of many food chains. We eat wheat, rice, vegetables, fruits and so on. We also eat meat and drink milk. But men often break up the food chains. They kill wild animals. They also make rivers, lakes and seas dirty. When these rivers, lakes and seas are polluted, the fish in them can not be eaten. If men eat the fish, they will get strange diseases. Each form of life is linked to all others. Breaking the links puts all life in danger.
All life needs sunlight to live on. But only plants can use sunlight directly. Plants are "factories". They make food from sunlight, water and things in the soil and air.<br>Plants feed all other living things. Animals can only use the sun's energy (能量) after it has been changed into food by plants. Some animals' feed directly on plants, others eat smaller animals. Meat-eating animals are only eating plants indirectly.<br>What about human beings? We are members of many food chains. We eat wheat, rice, vegetables, fruits and so on. We also eat meat and drink milk. But men often break up the food chains. They kill wild animals. They also make rivers, lakes and seas dirty. When these rivers, lakes and seas are polluted, the fish in them can not be eaten. If men eat the fish, they will get strange diseases. Each form of life is linked to all others. Breaking the links puts all life in danger.
正在翻译中..