Aperson on earth would weigh a lot more on the sun due to what?

Should be Gravity. since the mass of a sun is quite larger than the mass of the earth, it's gravitational pull will be much higher, making you weigh a lot more than you would on earth. however, i don't think it would be safe to stand on the sun xD 

Manual pipetting creates a musculoskeletal load on the neck, shoulders, and upper limbs and the type of injuries that this can lead to is called repetitive stress injuries.

Answerit was located on high ground above the river