Designing a filter to achieve a specific frequency response
1= Once the low pass filter "killed" certain frequencies the high pass filter cannot "bring them back to life" (the high pass filter has constant gain for certain frequencies, let's say those higher to fh, but the low pass has ever increasing - theoretically speaking at least - attenuation for those frequencies. So the low pass filter wins).

2- The frequency response shown is easily obtained with a pole at frequency fl and a zero at frequency fh