问题 读图填空题

科学家在某处发现了一些动物的化石,其中有三种动物的头部化石保存比较完整。科学家经过研究认为这三种动物的食性各不相同,有食虫的、有食肉的、还有食草的,请回答:

(1)形成化石A的动物的食性应是________,判断的依据是:______________________________________________。

(2)形成化石B的动物的食性应是_______,判断的依据是: ______________________________________________________。

(3)形成化石C的动物的食性应是_______,判断的依据是:______________________________________________________。

答案

(1)食肉的。除了有门齿和臼齿外,还有发达的犬齿,用于撕裂食物

(2)食虫的。门齿尖锐,犬齿不发达,臼齿上有锐利的齿尖,用于吃虫

(3)食草的。只有门齿和臼齿,没有犬齿,这是与它的植食性生活相适应的

单项选择题
问答题

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