What type of scale is used when the variables studied are low and normal birth weights of newborns?

The influence of birth weight on the motor performance of newborns free from neurological disorders has been discussed in the literature with conflicting results, primarily with reference to premature infants. This has happened because many prognosis studies have been based on birth weight and have not taken into account the appropriateness of that weight to the infant's gestational age. It is important to differentiate between transitory and physiological situations that occur during the first year of life of effective developmental delay.6-8

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the answer is b, encourage free trade

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane