When you move your arm to use your computer mouse, which of these muscle cell types is involved?

cardiac

skeletal

smooth

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

What are two reasons for why a species might disappear from the fossil record?

The intervention of extraterrestrials has been used to explain the bermuda triangle, a region of the atlantic ocean where ships and planes are frequently lost, leaving no evidence behind. how would this explanation best be characterized?