Which organelle appears as a stack of membranes? a. mitochondrion b. vesicle c. cell membrane d. golgi apparatus

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?

Are the layers of rock above and below the coal older or younger?