Interpretation. The statement is implying that the reader wants to know what it means to them. It could mean something different or varied to a different person. What the writer 'says' to a person (or what they take from a passage) can be interpreted to their own personal life. That is called actively reading.
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Well, the blue jay is often very agressive, so you can put "agressive". Alternatively, it's also territorial, so you can put "territorial" too. Also: noisy, bold, curious
The answer to this question would be C. It is surprising how the person doing the giving gets the most in return.
The trash can? Only makes sense.