Manual pipetting creates musculoskeletal load on the neck shoulders and upper limbs what type of injury can this lead to a fracture stress injuries b repetitive stress injuries c vibration stress injuries d compression stress injuries

The correct answer is option b, that is, repetitive stress injuries.  

The repetitive stress injuries are developed by imparting an excess amount of stress on one particular part of the body on a continuous basis. The stress develops swelling on that particular part of the body along with tissue damage and muscle strain in certain situations. This generally occurs in the individuals who are forced to hold one same movement or position for a longer time duration.  

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d