Competition within a pack of wolves may increase of there is an increase in the

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.