Final answer:
The shears that remove less hair than 'Single-Notch' shears are less effective.
Step-by-step explanation:
The statement about the shears that removes less hair than 'Single-Notch' shears is that they are less effective. According to the provided information, the three-blade design is the most efficient, while the 2 or 1-blade designs are less efficient. The lower tip speed of the three-blade design also makes it less dangerous. Therefore, the shears that remove less hair than 'Single-Notch' shears are less effective.