Answer:
The act of birds sitting over their eggs to hatch them.
Explanation:
Brooding in the context of Integrated Science is an act performed by birds over the eggs they laid. They sit on them as a form of incubation till they hatch to chicks. Incubation on its own is a way of providing consistent heat and humidity for the eggs till they hatch to chicks.
Even after the eggs have hatched to chicks, the birds can also perform brooding by spreading their feathers over the chicks to provide them warmth till they are properly developed.
