Because it pollutes the atmosphere and isn't a renewable source of energy
Answer:
D. Calcium
Explanation:
A chelate is produced when a multidentate ligand forms two or more coordinate bonds with a metal ion present to create a ring structure.
In this case Ca++ is the metal ion forming COORDINATE bond
Maybe you should post this again my screen is black !!
In broad terms, finches. In specific terms, he observed how over time, the beak sizes and shapes of said finches changed to adapt to the food sources available.
I hope I was able to help. Best of luck.