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What happens in the bitcoin network when two miners solve a block at the same time?
The chain ends up with two ends (each one with each of the 2 miners block at the end). The one that will be eventually chosen is the one who gets linked first to a following block. In that situation, the transactions that were in the block of the losing miner are returned to the mempool. -
What is a stale block?
A stale block is a block that doesn’t get linked to a follower block -
How do stale blocks occur?
See answer to question 1 above. The block that didn’t “win” and didn’t get linked to a following block is called stale and the transactions that it contained and were not included in the “winning block” are then returned to the mempool to be included in another block. -
Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
You want to make sure that your transaction was not in a block that end up being stale. So waiting for 6 following blocks to be linked to the block containing your transaction is a way to super insure that your transaction went trough.
Hello miss, i think you have post your homework asnwers in a different topic, i suggest you to go into the lesson of this homework and follow the link to the forum, then you can copy/paste the same answers 
(maybe this is the link for the correct assignment? Homework on Stale Blocks)
If you have any more questions, please let us know so we can help you!
Carlos Z.
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