The formation of bone from a cartilaginous model is termed

Evolution

Explanation:

Evolution is the gradual directional change especially one leading to a more advanced or complex form

From a cartilaginous model, bone evolved into existence because it is STRONGER, AND MORE RESISTANT to diseases and external conditions than the preceding Cartilage.

Note that the aim of Evolution is to expressed traits with highest survival rate; so, there is BONE.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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