Solve:
Cos 7x = cosx-sinx

Contrast how pollination is different among gymnosperms and angiosperms.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?