Which situation below would have the strongest gravitational force between them?

A 10 kg mass and a 10 kg mass at 30 km apart.

A 2 kg mass and a 2 kg mass at 10 km apart.

A 10 kg mass and a 10 kg mass at 10 km apart.

A 10 kg mass and a 2 kg mass at 30 km apart.

Which of the following describe the role a biochemical pump plays in active transport? a it prevents water from moving across the cell membrane. b it uses energy to move materials across the cell membrane against the concentration gradient. c it large molecules cross the cell membrane without using energy. d it a cell move molecules from an area of higher concentration to an area of lower concentration.