Usually, the next step up from bacteria in most food chains are protozoans (such as amoebae and even microscopic crustaceans), and they are the biggest eaters of bacteria.
Usually, the next step up from bacteria in most food chains are protozoans (such as amoebae and even microscopic crustaceans), and they are the biggest eaters of bacteria.
通常，在大多数食物链里，细菌的上一层便是原生动物（如变形虫乃至用显微镜才能看见的甲壳虫），而它们就是细菌的最大食用者。