Here is my take.
a) Modifier issue. Ing modifier when following a clause imply that the action is happening at the same time. How can you have appearing and vanishing together. Also, the other usage of ing modifiers is to indicate a consequence- again something which is nonsensical in this case.
b) This can't be right. If 99% of the species that appeared have disappeared, then it means that some species still appear because not all of them have disappeared(not the best way to represent what I
...
a) Modifier issue. Ing modifier when following a clause imply that the action is happening at the same time. How can you have appearing and vanishing together. Also, the other usage of ing modifiers is to indicate a consequence- again something which is nonsensical in this case.
b) This can't be right. If 99% of the species that appeared have disappeared, then it means that some species still appear because not all of them have disappeared(not the best way to represent what I
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