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?

chemical weathering

explanation:

one centimetre is equal to 0.01 metres

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.