Why do the positions of stars change in the universe? (why do stars change position when we look up at the nigh sky?) -stars get bigger as they age -the universe is contracting (getting smaller)
-the universe is expanding (getting bigger)
-stars get smaller as they age Previous​

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