
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the function $f(x)= \begin{cases} -x^{2}-2x, & x\leqslant m\\ x-4, & x > m \end{cases}$.
- (1) When $m=0$, the number of zeros of the function $f(x)$ is ______.
- (2) If the function $f(x)$ has exactly two zeros, then the range of the real number $m$ is ______.

Present the answer in LaTex format: \boxed{Your answer}
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