Test variable (independent variable): CRICKET FROGS Outcome variable (dependent variable):population Control group:

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods. c. it shows that these organisms share the same habitat. d. it provides evidence that these organisms suffered a genetic mutation.

This is the interaction of two organisms where one is and the other is neither nor harmed.