Which of the following best explains how a dog is able to ingest and digest food, and remove waste
products from its body?
Choose 1 answer:
A dog carries out digestion and excretion through a series of redundant systems, so if one
system is injured, another will take its place.
A dog has cells whose genetic makeup can change depending on the circumstances, such as
whether the animal is ingesting and digesting food, or excreting waste.
A dog has systems of specialized cells, such as those that make up the urinary tract and
digestive system, that help it carry out these functions.