May be a I don’t know sorry
Any lump of osmium is. Iridium and gold are also very close.
The plasma membrane of a cell is a group of lipids and proteins that forms the boundary between a cell's contents and the outside of the cell.
Answer:




Explanation:
m = Mass of block = 15.2 kg
g = Acceleration due to gravity = 
= Angle
a = Acceleration
F = Applied force
Normal force is given by







C. Tides
The gravitational pull on both sides of the earth causes a bulge from the tides