Experiment – when an idea is tested. Independent Variable – measured (time or temp.) Dependent variable – manipulated variable. (WHAT you are measuring…) Control – part of the experiment that is kept constant – for comparison.
Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Smithers counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
a)What is Smithers hypothesis? a)The magic juice will improve workers productivity b)What is the independent variable? a)The time the workers were asked to staple papers c)What is the dependent variable? a)The amount of papers the workers stapled. d)What are his controls? a)Same amount of workers in each test group b)Same amount of juice in test group c)Same amount of time workers could staple. e)What should Smithers conclusion be? a)The juice had no, if not a negative effect on the workers productivity.
How can we make this a good experiment? Use a large sample size Use controls! Test only 1 variable at a time Repeat experiment to see if you come up with the same conclusion every time.
Hypothesis – idea that can be tested. Theory – a hypothesis that has been tested many times and has a lot of evidence supporting it.
Cells grow when a single cell divides into two cells and that process keeps going it is called mitosis. When you reach adult hood and you stop growing it will still do this process because the old cells died out & dried out and new ones will replace them
Factors within the environment that affect populations because of their size. Ex. Disease, Famine
Factors within the environment that affect populations regardless of their size. Ex. Weather
Secondary Succession - starts from soil, usually occurs after a disturbance, like a fire or humans clearing forests. Primary Succession - starts from bare rock, the first life form, the pioneer species, is typically lichens and moss, they eventually develop soil, then larger types of vegetation can take hold; the largest form of vegetation in an area is called its climax community