Why do scientists use variables?
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Answer      

a varlable is any item, factor, or condition that can be controlled or changed and Using these variables correctly helps scientists measure cause and effect in scientific experiments and allows scientists to manipulate cause and effect to produce desired outcomes

Explanation:

so thats why i hoped it helped.

answer by yourhope:

hi! : )

in which structure in the nucleus are ribosomes made?

b) nucleolus!

: )