Final answer:
The statement 'it is important to back up most of your claims, but you need not back up all of them' is true.
Step-by-step explanation:
The statement 'it is important to back up most of your claims, but you need not back up all of them' is true.
When making claims or assertions, it is essential to provide evidence and support for most of your claims to strengthen your argument.
However, not all claims require backing up, especially if they are common knowledge or widely accepted facts.
For example, stating that 'water boils at 100 degrees Celsius' does not need additional proof because it is a well-established scientific fact.