Final answer:
The relationship between nectar-producing flowers and nectar-feeding birds is a mutually beneficial interaction called mutualism.
Step-by-step explanation:
The relationship between nectar-producing flowers and nectar-feeding birds is a true statement. This is an example of a mutually beneficial interaction called mutualism. The flowers provide nectar as a food source for the birds, while the birds help to pollinate the flowers by transferring pollen from one flower to another.