Weegy: It is important to wear proper protective equipment in lab even when not actively performing experiments because accidents can affect any researcher, even one not working on an experiment. True (More)

Weegy: An independent variable is : b. manipulated by changes to the dependent variable. (More)

Weegy: d. rulers are not used to perform experiments with liquids. (More)

Weegy: The answer is c. The main purpose of models is to study systems that no longer exist. plato.stanford.edu/entries/models-science (More)

Weegy: A model can be used to explain and predict real phenomena. [ [ ]1- -Regression testing must consist of a fixed set of tests to create a base line Don't think it is true as a "must" - it depends on whether your regression testing style involves repeating identical tests or redoing testing in previously tested areas with similar tests or tests that address the same risks. For example, some people do regression testing with tests whose specific parameters are determined randomly. They broaden the set of values they test while achieving essentially the same testing. Second example- some regression test suites include random stringing together of test cases (they include load testing and duration testing in their regression series, reporting their results as part of the assessment of each build). Depending on your theory of the _point_ of regression testing, these may or may not be entirely valid regression tests ] (More)