If there are sixty seconds in a minute and sixty minutes in an hour, than why are there only twenty four hours in a day?

Because on the clock 6 is half and 12 is a full circle. there are 2 cycles of a clock in a day. So 12 * 2=24

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.

(the column on the right side has numbers 1-4 as well)

from left column to the right marching definition column:
1=2
2=4
3=1
4=3