What is the benefit of collaborative discussion when trying to develop a hypothesis about a certain situation?

Crayfish, like the one seen here, lives in water. Bennie wondered how changes in temperature would affect the movement of crayfish. He wanted to design an experiment to test his idea. What would be Bennie's manipulated/independent variable in the experiment?

Models are frequently used in science to assist in the understanding of complex information. Models can include items like a working volcano, an aquarium, or a stream table. What type of model are each of these items?

Alex decides to find out which fertilizer is best for tomatoes. He set up three identical plants, all with the same soil, giving one no fertilizer, giving the second type A fertilizer, and giving the third type B fertilizer. In this experiment, what is the independent variable?

Maria and Jane set up a lemonade stand one summer to earn money for a trip to the beach. They noticed that the hotter the day, the more glasses of lemonade they sold. They mixed up the lemonade exactly the same way every day: the same amount of sugar, lemon juice, and water. They added ice to the glass when they poured the drink. They always used the same size glass. They decided to chart their sales in order to figure out how much lemonade to make each day, using the weather forecast as their guide. Identify the dependent variable in the girls' experimental data.

Which statement is NOT true concerning setting up an experimental design?

Sally and Maria hypothesized that earthworms lived only in dark, damp places. They measured a one-meter square in a shady spot near a stream. They dug through the soil and collected earthworms. They collected 43 worms. They repeated the experiment in several locations, sunny and dry included. They found the most worms in the shady, damp plot near the stream.

Several other groups of science students carried out the same experiment and got similar results. This is an example of

Maya's father told her that hummingbirds like to drink the nectar from red flowers. Maya noticed that most of the hummingbird feeders in the store were made of red plastic. She wondered if hummingbirds really do prefer red flowers. She decided to conduct an experiment to find out. Maya hung three different colored bottles (red, green, and clear) upside-down in her garden. She filled the bottles with the same sugar solution and screwed a drip nozzle into each one. Then she waited and watched.

What are the controlled variables in this experiment?

Jeremy performed an experiment to determine the best method of cleaning hands to avoid illness.

What would be a valid conclusion based on the data Jeremy collected?

An organized procedure to study something under controlled conditions.

The experimental factor that is manipulated; the factor that is being changed by scientist on purpose.

Describes what scientists expect to happen every time under a particular set of conditions.

A testable explanation for a problem

When an accurate experiment is repeated by another scientist, the results

Relating to, measuring, or numbers

Making multiple sets of measurements or observations in a scientific investigation; multiple trials

A conclusion reached on the basis of evidence and reasoning

A representation of an object or event.

Carlos reviewed the data on water use in the United States. Carlos wanted to help conserve water, so he and his father fixed all the leaks in the house and garage. Carlos hypothesized that if they fixed their leaks, they would not use as much water as before. What MUST Carlos do to make this a real experiment?