How are igneous rocks formed?

a. compaction and cementation of sediments
b. cooling and solidification of magma
c. weathering of rocks
d. application of pressure and heat to sedimentary rocks

How are tumors cells different from normal cells

The cluster of developing cells from conception until birth is called an

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of