Answer:
Duckweed can outcompete submerged plants for light, and the submerged
plant populations can decrease.
Step-by-step explanation:
Duckweed will form clusters of leaves and hence will exist as floating mats. As a result, they will be able to get more sunlight from the sun and as the submerged plants will be lower, they will not get enough light. As a result, the submerged plant population will begin to decline. This will occur because they will not get sunlight to carry out the process of photosynthesis and could not be able to make their food.