manipulated variable



responding variable


1)_________________ is a truthfinding system about the natural world. It bases truth on 2)_______________, which are observations and measurements made using our five senses and equipment such as microscopes and meter sticks. The process begins when a person makes an 3)____________________ while looking or thinking about nature. People are curious. They are not satisfied with simply observing happenings in nature. They must ask questions which can lead to formulating a 4)__________________ that can be researched using the scientific method. A problem has two variables within it. One variable can be changed and tested by the scientist. This is the 5)___________ ___________. When it is changed by the experimenter, a 6)___________ _________ is measured to see how it was affected by the manipulated variable's adjustment. After the problem is stated, the scientist will then do research on what is already known about it. When sufficiently educated, the scientist makes an educated guess called a 7)_________________. He or she will state what they think the relationship between the manipulated and responding variable is.


control group

controlled experiment

experimental group

extraneous variables


qualitative data

quantitative data

spontaneous generation


The scientist's next job is to test the hypothesis with a 8)__________ ____________. He or she designs this test with two groups to keep all other variables known as 9)_____________ ___________ constant. Extraneous variables mess up experiments. 10)________________ are all the conditions that are the same for both groups. One group is setup just to be a comparison group called the 11)__________ ______________. It does not receive the treatment of the manipulated variable. The 12)____________ ____________ is the group that does receive the treatment of the manipulated variable. The scientist then runs the experiment and takes data. There are two types of data. When we observed blood worms, saying they were "wiggling faster" or "slowed down" would be examples of 13)____________ ____________. These are opinions and judgements and are NOT standardized. Standardized measurements, such as cm, seconds, and liters, are known as 14)_____________ _____________. After recording and analyzing the data a scientist can make an 15)________________ as to what the answer to the problem is. This can be written into a conclusion and the results will be published.

Years ago, people observed tadpoles appearing in new puddles of water after a rain. They observed rats appearing in sacks of corn in their homes. They observed wiggling creatures in pots of food left unrefrigerated. They came up with a hypothesis to explain that life appeared to be coming from nonliving matter such as soil, water, and broth. It became a 16)______________ because the hypothesis was supported by many thousands of scientists that made the same observation. 17)____________ ___________ was a theory that life came from nonliving material. Thanks to scientist such as Spallanzani, Redi, and Pasteur, we now have a new revised theory: Life is made of cells which only come from other living cells.