作業

3-5

About two-thirds of the world's people survive primarily by eating wheat,rice and corn at the first trophic level,mostly because they cannot afford meat.The large loss in chemical energy between successive trophic levels also explains why food chains and webs rarely have more than four or five trophic levels.

只吃麥子、米和玉米生存在第一個食物,食物鏈很少會超過四個或 五個食物屬性

4-3

For example,Chinas giant panda is highly endan-gered because of a combination of habitat loss,low birth rate, and its specialized diet consisting mostly of bamboo.
Some shore birds occupy specialized niches,feeding on crustaceans,insects,and other organisms on sandy beaches and their adjoining coastal wetlands.

因為環境與飲食的關係,會造成中國熊貓瀕臨絕種