A student wants to know if the bubbles on this water plant are oxygen gas
(02). However, identifying a gas as O2 with direct evidence requires many
kinds of equipment.
Which observation would provide indirect evidence that the bubbles are 0?
O
A. A measurement of the plant's growth over time
O
B. A description of the color of the light under which the plant is
growing
O
C. A description of the shape of the plant's leaves
D. A count of the number of bubbles produced by the plant in the
dark​