A researcher is conducting a longitudinal study on how age affects the learning of a new language. In this study, age is a factor that differs for each participant. The learning capacity of each participant also differs based on his or her age. In this context, age and learning capacity are both measurable traits that are likely to differ from one time to another. Therefore, age and learning capacity are examples of .

This question lacks options, options are:

a. hypotheses

b. variables

c. principles

d. theories.  

The correct answer is b.

Explanation:

The variables in a study are the characteristics and quantitative or qualitative properties of an object or phenomenon that acquire different values, that is, they vary with respect to the observation units. The variables are the concepts that form statements of a particular type called hypothesis. The independent variable is the phenomenon that will be evaluated for its ability to influence, influence or affect other variables. Dependent variables are properties or characteristics that you try to change by manipulating the independent variable. The dependent variables are the ones that are measured.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.