A student wonders if the bubbles on this water plant are oxygen gas (O2). However, identifying a gas as O2 with direct evidence requires many kinds of
equipment
Which observation would provide indirect evidence that supports a
hypothesis that the bubbles are O2?
O A. A description of the shape of each leaf after a plant is kept under
dim light
O B. An increase in bubbles on the plant when it is moved under a
brighter light
O C. A decrease in the approximate size of each leaf on plants kept in
darkness
OD. A count of the bubbles produced over time by one plant under
bright light