b,d,f,e,c,a is the order in which it goes as the scientific method
The earth is divided into four main layers: the solid crust on the outside, the mantel, the outer core and the inner core. out of them, the crust is the thinnest layer of the earth, amounting for less than 1% of our planet's volume. hope this helps!
A cells relatively constant internal physical and chemical conditions are called Homeostasis.
