正确答案E ： Australia embryologists have found evidence to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved as a kind of snorkel.
疑问：
1.‘and ’两边应该平行 但是为 么 that the elephant is descended from an aquatic ，而 that its trunk originally evolved 一个一般现在时，一个过去时，这样平行吗？
2.假设上边句子成立，两个都表示在陈述事实，那么 把evolved改成 was evolved 可以吗？
继续求高人解答，不胜感激！
