2. that have / Earth's history / mass extinctions / the / threatens / periodically during / occured / the / and / to surpass
- And threatens to surpass the mass extinctions that have occurred periodically during the Earth’s history.
The answer given above seems wrong. My teachers have told me that we should never start a sentence with a conjunction. Is it true?

Dear Student,
Given below is the answer to your question.

It is believed that a sentence cannot start with a conjunction. However, this is a debated issue.
Please re-check if the question you have posted is correct as there seems to be an extra word in the question (and). A probable answer is given below. 

The mass extinction that threatens to surpass have occurred periodically during the Earth's history.

I hope you find this answer helpful. Please post more questions on the forum to be assisted by our team.                               
Thank you.
 

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Yes but in some cases it would
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