Read This! When designing an experiment, you need to consider three types of variables. The independent variable is changed by the experimenter in the design of the experiment. This variable is sometimes called the
"manipulated variable." The dependent variable is what changes as a result of the change in the inde-
pendent variable. This variable is sometimes called the responding variable." In some cases more than
one dependent variable is considered. The third category of variables is controlled variables. These are variables that you think may change the outcome of the experiment, but since they are not being studied,
they need to be kept constant in each trial.

(QUESTION)
9. Identify the independent, dependent, and controlled variables for the experiment that produced
the data in Model 3

Independent:

Dependent:

Controlled:

Complete the sentences by matching the names of trees to the appropriate blanks. to do this, drag the names on the left into the appropriate blanks in the sentences on the right. match the words in the left column to the appropriate blanks in the sentences on the right. terms may be used more than once. make certain you have filled every blank with a term before clicking submit. 1. deciduous trees lose their leaves seasonally and include trees such as maple and elm. 2. conifer leaves are generally thin and needle-like, while seeds are contained in cones. conifers include cedar and pine. 3. evergreens are plants that maintain their leaves in all seasons and include trees such as cedar, elm, and pine. 4. hardwoods reproduce using flowers and have broad leaves; hardwoods include trees such as maple, , and cedar. elm returned you filled in 2 of 10 blanks incorrectly. mango trees are tropical broad leaf plants that maintain their leaves all year long. no credit lost. try again.

How are the reproductive cycles of a fungus and a pteridophyte similar? a)both organisms form fruiting bodies that produce diploid seeds. b)both organisms produce haploid spores and exhibit diploid and haploid stages. c)both organisms reproduce sexually when two haploid hyphae fuse. d)both organisms exhibit a diploid stage and are only able to reproduce asexually.

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review