Astudent wants to know if the bubbles on this water plant are oxygen gas(02). however, identifying a gas as o2 with direct evidence requires manykinds of equipment. which observation would provide indirect evidence that the bubbles are 0? oa. a measurement of the plant's growth over timeob. a description of the color of the light under which the plant isgrowingoc. a description of the shape of the plant's leavesd. a count of the number of bubbles produced by the plant in thedark