Which statement about freshwater resources in the region is accurate? ( )

a. drought, salt, and agricultural runoff threaten freshwater in australia.
b. the murray-darling river basin is not affected by growing urban populations.
c. the lack of clean drinking water in oceania does not pose barriers to economic growth.
d. oceania’s atolls hold unlimited supplies of freshwater.

Ineed to know why d is the correct answer asap

The pattern of this wave changes between its beginning and end. what is true about the amplitude and wavelength of the wave when the pattern changes?

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?