Answer:
DEVELOPMENTAL NORMS. Developmental norms are defined as standards by which the progress of a child's development can be measured. For example, the average age at which a child walks, learns to talk, or reaches puberty would be such a standard and would be used to judge whether the child is progressing normally.
Explanation:
The LEGS. Reason Being is that it can and will put less strain on your back.
The recommended weight limit according to NIOSH would be base on an equation and is dependent to a number of factors. This equation is called the NIOSH Lifting equation. Under ideal conditions, the maximum recommended weight is 51 pounds. Hope this answers the question.
I think either b or d but I’m leaning towards d a little
