Select each correct answer. More than one answer may be correct.
Which of the following relationships is symbiotic?

A. A group of ants work together to build an underground nest.
B. A tick latches on to the body of a dog and feeds on the dog’s blood.
C. A remora attaches to the body of a shark and feeds on scraps when the shark eats.
D. A male bluebird and a female bluebird provide care for their offspring.
E. Two male red-winged blackbirds fight over territory.
F. A bee pollinates a flower while feeding on the flower’s nectar