A theory is an important part of science because it can be used to A. Create better questions B. Create better experiments C. Test a hypothesis D. Make predictions A student designed an experiment to test the affect of salt on the number of plants that live in water. What is the dependent variable in this experiment? A. The water B. Water temperature C. The number of plants living in the water D. The amount of salt in the water
What is an appropriate way to analyze the results of an experiment A. Creating a graph B. Creating a data table C. Making observations D. Asking questions
What is a control group used for? A. Making an observation B. Making a comparison C. Designing an experiment D. Making a hypothesis

What I had was #1 D #2 A #3 B #4 A

I got

1 = B

2 = D

3 = C

4 = B

Explanation:

With a theory, you can have a better understanding of your experiment and know what to do specifically.

The amount of salt in the water is dependent because if you were to put too much salt or too little salt in the water, it was make a difference.

I either chose C or D but I think C fits better with what you have to keep a look out for while analyzing an experiment.

A control group is basically like this:

Plant A has food coloring (Experimental Group)

Plant B has no food coloring (Control Group)

After a few days you look at the comparison of both plants (of course with the equal amount of sunlight and water and temperature.)

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."