The process by which modern organisms have descended from ancient organisms

How can an organ, such as the lungs, work for multiple body systems?

Due tonight 10 points will mark brain

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament