The flower of snow buttercups (ranunculus adones) face one derection in the morning, move throughout the day , and face the other way by evening . Most likely is respond to which stimulus

Fill in the blanks for the following statements: the rms speed of the molecules in a sample of h2 gas at 300 k will be times larger than the rms speed of o2 molecules at the same temperature, and the ratio µrms (h2) / µrms (o2) with increasing temperature.