im pretty sure the answer is going to most likely be A: decomposing dead plants and animals
90% of people weigh more than Nikoleta and 10% weigh less.
Answer:
The return of blood to the heart is assisted by the action of the skeletal- muscle pump. As muscles move, they squeeze the veins running through them. Veins contain a series of one-way valves, and they are squeezed, blood is pushed through the valves, which then close to prevent backflow.
The Nucleolus helps function the cell.
