Which of the following options would be considered independent samples? a. A group of teenagers (age 13-19) measured on preference for Yellowstone National Park before and after visiting.
b. A group of teenagers (age 13-19) and a group of adults (age 20 or older) measured on preference for Yellowstone National Park before and after visiting.
c. A group of teenagers (age 13-19) measured on preference and brand attitude for Yellowstone National Park before and after visiting.
d. A group (age 13 and older) measured on preference for Yellowstone National Park before and after visiting.

H=   2(area/a+b)h= 2(144/a+b)h= 2(144/18+18)h= 2(144/36)h= 2(4)h=8

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.

Answergoogle earth; i believe this is the correct answer, plz check first;

The latin america and caribbean (lac) region encompasses countries with great environmental issues. the southern portion of central america to the caribbean's part, including south america presses the major environmental issues like deforestation and   habitat subsistence. the requirement of the whole country and the pressure of export is being done by this region as it possess the soil with highest fertility rate and maximum strength which could us in modifying the various technology for the humankind. because of deforestation, we take animal shelters away from them, so the major issue occurs again which we known as "habitat subsistence". government has to set the target according to the capacity of a certain region which would not affect the environment. then, businesses and organizations have to understand their roles and need to divide the task into several groups (one for each, according to their natural capacity), individuals can the government or statuary body by just following their guidelines and never harm or exploit the environment for our own use.i really hope this you out!