D because the others harm the bird instead of helping
The answer would be -- A. Cenozoic
Answer:
Explanation:
Preparation of competent cells -
Transformation
recovery
plating
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!
