Smooth muscle is not cross striated because: Myosin and actin in the myofibril
Myofibril are in register with each other
Myofibrils are not in register with each other
It has a gap junctions
It is surrounded by a basal lamina

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

to this one it would be receptive field