Bacteria on the roots of soybean plants fix the nitrogen from the atmosphere so that it is available to the plant, the bacteria also receive carbohydrates from the plant roots

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?