Please answer the following question: Fact 1: Plants detect and respond to the daily cycle of light and darkness. Fact 2: Diurnal cycles Diurnal cycles are the daily cycles of light and darkness. Given the two facts above, answer the question "Plants detect and respond to what?" with the following options: - water cycles - Greenhouse gasses - plant cycles - Electrical energy - sleep cycles - heat or cold - Diurnal cycles - Temperature changing
A:
Diurnal cycles