In a labor union, laborers
must work day shifts
must be under eighteen years of age
must work in cotton mills
work together in negotiating for better wages and conditions

The correct answer is - work together in negotiation for better wages and conditions.

The laborers in a labor union are working together and support each other for the interest of all of them sot hat they can get better wages and better working conditions. This is also important because they work as a unit, so the owners do not have the upperhand and have to take in consideration their requirements. The labor unions are very important for the protecting the rights of the workers as well, so that they are not under threats, or forced to do anything they are not supposed to.

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soviet cosmonaut valentina tereshkova became the first woman to fly to space when she launched on the vostok 6 mission june 16, 1963. valentina tereshkova was the first woman to go into space. in 1963, she spent almost three days in space and orbited earth 48 times in her space capsule, vostok 6.jan 22, 2018

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.