A student conducted an experiment to test whether talking to plants would help them to grow faster. He set up the following two groups: Group 1: spoken to and hand watered
Group 2: not spoken to and watered with sprinklers

After three weeks, the plants in Group 1 showed much more growth than those in Group 2. Based on the results of this experiment, which is the best conclusion?
They are valid because the student ran a controlled experiment.
They are not valid because the student did not control all the variables that can affect plant growth.
They are valid because the dependent variable caused a change in the independent variable.
They are not valid because the time frame to grow a plant is too short.

Because a model would make the investigation easier to understand

Ci hope  it  you

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  d.landing on and exploring the moon4. which of these space missions involved the deployment of lunar rovers d.apollo5. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar systemb.safir7.which technology limit the future of space exploration b. scientist must first develop certain technologies before missions can be completed.

The answer is c. risk