Commonwealth a) only have ceremonial ties to their mother country b) are involuntarily linked to a mother country c) are not dependent upon their mother countries after gaining independence d) are dependent upon their mother counties for defense and foreign policy issues

I am pretty sure it is D because Puerto Rico depends on the United States just like Guam.

The answer is A. This answer can be explained if you reseach the relationship between the US and Puerto Rico.

Mexico has a host of environmental problems, including significant chemicalpollution  from factory discharges and waste dumping, but the main threat to itsbiodiversity  probably stems from  deforestation  and other natural habitat losses. forest habitat is lost for a number of reasons

Empty quarter and sandy desert