The statement that would best keep the world's oxygen supply from decreasing:
a.Planting trees in forests that have been harmed
Trees decrease the urban heat island effect via evaporation cooling and lessening the amount of sunlight that reaches parking lots and buildings.
Answer:
the answer is D, they both develop calcium carbonate structures
Explanation:
The doppler effect is when sound travels away from a moving object, the frequency can be different depending on the location at which you recieve the sound.
I hope that helps
