Final answer:
Allergic reactions in animals can be indicated by symptoms such as purities and facial edema.
Step-by-step explanation:
c. Purities, facial edema
The symptoms of allergies in animals may include purities and facial edema. These are signs of an allergic reaction where the immune system overreacts to a harmless substance in the environment. Just like in humans, animals can develop allergies to various substances such as pollen, food, or certain chemicals.