Hi Nipun,
Digging in sediments in Northern china,
evidence has been gathered by scientists suggesting that complex life -forms emerged much earlier than they had previously thought.
The sentence means that scientists dug in sediments in Northern China and gathered evidence that suggests that complex life forms emerged much earlier than previously thought.
Error Analysis:1. Verb-ing modifier “digging” is illogically modifying “evidence”. This modification suggests that “evidence” did the action of “digging”. The subject of the main clause should be “scientists” because they did this action.
2. Again, verb-ing “suggesting iis incorrectly modifying the preceding noun “scientists”, suggesting that “scientists” suggested something. It is the “evidence” that did the action of suggesting.
POE:A) evidence has been gathered by scientists suggesting that complex life –forms emerged much earlier than they had:
Incorrect for the reasons stated above.
B) evidence gathered by scientists suggests a much earlier emergence of complex life-forms that had been:
Incorrect. 1. This choice repeats the same modification error of choice A.
2. The phrase “a much earlier emergence of complex life-forms” is not very clear and direct.
C) scientists have gathered evidence suggesting that complex life forms emerged much earlier than:
Correct.D) scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was:
Incorrect.1. The phrase “a much earlier emergence of complex life-forms” is not very clear and direct.
2. “that” stands for “a much earlier emergence of complex life-forms”. This makes the comparison illogical.
3. There is no need of this illogical comparison presented by “that”.
E) Scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that:
Incorrect. This choice repeats the errors of choice D.
The answer to your second question is yes. Gerunds can be used in the beginning of the sentence. Take these sentences for example:
1. Drinking green tea is better than drinking coffee.
2. Swimming is my favorite sport.
3. Growing flowering plants is Harry’s hobby.
Notice that in all the above sentences, gerunds are the subject. But, when we have verb-ing modifiers in the beginning of the sentence, they are followed by a main clause.
Hope this helps.
Thanks.
Shraddha