In a research study by jeng et al., (2000), what percentage of very-low-birth-weight (vlbw) infants were walking by 18 months of age? a.50%b.89%c.100%d. it depended upon the gender of the child

The answer is b. 89%

Explanation

In a research study (Prognostic factors for walking attainment in very low-birthweight preterm infants) by Jeng et al., (2000), 89% of very-low-birth-weight (VLBW) infants were walking by 18 months of age; 11% of VLBW infants were still unable to walk at the same age.

tbh idk same thing here

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.