Earth is approximately spherical in shape like all planets and stars. Earth is composed mostly of rock. Three-fourths of its surface is covered by a relatively thin layer of water (some of it frozen), and the entire planet is surrounded by a relatively thin blanket of air.
The answer is C, Calcitriol. :)
Environment Stressors are conditions in your physical surroundings
It maybe a fracture? but I'm not sure
Answer: 220 subtracted age
Explanation: