Answer the following question given this paragraph: Simple diffusion occurs when a substance diffuses through a cell membrane without any help from other molecules. The substance simply passes through tiny spaces in the membrane. It moves from the side of the membrane where it is more concentrated to the side where it is less concentrated. You can see how this happens in Figure below . Q: What occurs when a substance diffuses through a cell membrane without any help from other molecules? Choices: - simple filtration - visible diffusion - visual diffusion - simple diffusion A:
simple diffusion

Answer the following question given this paragraph: Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. Contrary to popular belief, machines do not increase the amount of work that is done. They just change how the work is done. So if a machine increases the force applied, it must apply the force over a shorter distance. Similarly, if a machine increases the distance over which the force is applied, it must apply less force. Q: If the amount of force of that is applied is increased, what happens to the work that a machine is producing? Choices: - it's unchanged - it is harder - it's variable - it is easier A:
it is easier

Answer the following question given this paragraph: One idea is that evolution happens. Evolution is a change in the inherited traits of organisms over time. Living things have changed as descendants diverged from common ancestors in the past. Q: What is defined as a change in the inherited traits of organisms over time? Choices: - variation - divergence - generation - evolution A:
evolution