The united states tennis association is researching the effect of what color the professional tennis players wear and the number of foot faults called on them in one match. they collect data from every televised event of the year, noting the color of the player’s clothes and how many foot faults were called on the player. which is this an example of?

Political boundaries are determined by the political party in control at all time true or false

Restricting immigrants from entering a country may be based on what belief?  

In what ways did the compromise of 1850 and the kansas-nebraska act of 1854 differ from the missouri compromise? both compromises used the established 36°30′ parallel to determine if territories would become free or slave states. both compromises used the mason-dixon line to determine if the territories would become free or slave states. both compromises let territories use popular sovereignty to determine if they would become free or slave states. both compromises only granted congress the power to determine if territories would become free or slave states.