Answer the following question given this paragraph: After birds lay their eggs, they generally keep the eggs warm with their body heat while the embryos inside continue to develop. This is called incubation, or brooding. In most species, parents stay together for at least the length of the breeding season. In some species, they stay together for life. By staying together, the males as well as females can incubate the eggs and later care for the hatchlings. Birds are the only nonhuman vertebrates with this level of male parental involvement. Q: What is another word for brooding- keeping eggs warm while the embryos develop? Choices: - spawning - fertilization - hibernation - incubation A:
incubation