The conclusion that the woman will likely find is that the tank without plants would have a lower amount of carbon dioxide due to the photosynthesis of the plants.
During photosynthesis, carbon dioxide is fixed into carbohydrates.
Photosynthesis is carried out by green plants and some bacteria.
Thus, the tank containing plants will likely have a lower amount of carbon dioxide due to the photosynthetic activities of the plants, unlike the tank that has no plants in it.
More on photosynthesis can be found here: https://brainly.com/question/1388366