People who live in hot, dry climates often rely on
for their drinking water

Some possible answers could be desalinization(removing salt from water), an oasis, and underground water sources(like ground water which can remain underground for thousands of years)

the answer to your question is:

c. complementary base-pairing

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

hope this any more questions i am here plz mark brainliest