Answer:
The odd one out is water lettuce because it grows in water, while the other trees listed grow on land.
also based on their habitats is water lettuce. Water lettuce is a free-floating aquatic plant that prefers stationary or slow-flowing water with high nutrient concentrations. It is sensitive to frost and grows in tropical and subtropical regions. Mahogany, Obeche and Iroko are all tropical hardwood trees that grow in moist deciduous forest and tropical rain forest. They are native to different regions of Africa, America and Asia, but share similar habitats.