1. A control group is ____________.
   1. A standard against which experimental groups are compared
   2. Identical to experimental groups except for one variable
   3. A standard with several variables against which an experimentalgroup is compared
   4. Both a and b

1. A specific aspect of an object or event that may change overtime or change among individuals is a ___________.
   1. Control group
   2. Experimental group
   3. Variable
   4. Sampling error

1. The fewer the number of individuals from a population that arechosen at random for an experimental group, ______________.
   1. The greater the chance of sampling error
   2. The smaller the chance of sampling error
   3. The less likely the differences among them will distort thetest results

1. Match the terms with the most suitable descriptions.

_______adaptive trait a. statement ofwhat you should find in nature if you were to go   

                                                              lookingfor it.

_______natural selection b. proposedexplanation; educated guess

_______scientific theory c. improveschances to survive and reproduce in prevailing   

                   environment

              _______hypothesisd. related set of hypotheses that form a broadly useful,testable

                                                                             explanation

              _______predictione. outcome of differences in survival and reproduction among

                                                                             individualsthat differ in details of one or more traits