Which factor has a positive effect on the quality of sleep? a. sleeping in a quiet environment. b. sleeping hours that synchronize with the circadian rhythm. c. spending additional time in stage ii of the sleep cycle. d. sleeping in a dark environment

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.