A researcher taking a dynamic-systems approach to motor development would be MOST likely to examine the impact of on the development of crawling.

multiple variables

Explanation:

Multiple variables entails that there may be more than one dependent variable and/or independent variable.

Such always comes to play out if you are conducting an experiment with multiple stages or sets of procedures.

In such type of experiments, there may be more than one set of measurements with different variables.

answer; (b) limited resource to satisfy virtually unlimited wants;

the correct answer is the letter a

bright white has the greatest comparative advantage as it produces more than double the amount of small tubes than large in an hour.

sparkling comes next as it produces exactly double the amount which is to be expected

fresh comes in third because it only produces 50 more small tubes than large.

the company that shows the least comparative advantage is mmmint as it produces the same amount of small and large tubes.