crayfish, like the one seen here, lives in water. Bennie wondered how changes in temperature would affect the movement of crayfish. He wanted to design an experiment to test his idea. What would be Bennie's manipulated variable in the experiment?

Select the correct answer from each drop-down menu the images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that the archaeopteryx and bird have wings, while dinosaurs have limhe se it can be concluded that