Are underground areas that have the ability to contain and provide water sources.
a. shamals
b. wadis
c. seas
d. aquifers

The answer is D. There are different types of aquifers (such as the unconfined and confined aquifers), however, they are all made up of permeable rock that holds underground water. The aquifer could be sandwiched between impermeable rocks called aquitard that restrict the movement of the water in the aquifer. This type is called a confined aquifer.

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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