Astudent wonders if the bubbles on this water plant are often 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. a. an increase in bubbles on the plant when it is moved under a brighter light b. a description of the shape of each leaf after a plant is kept under did light c. a decrease in approximate size of each leaf on plants kept in darkness d. a count of the bubbles produced over time by one plant under bright light