Left and right are the answers, respectively.
Studies have shown that, like humans, dogs may understand words and intonations coming from humans. In recent studies, scientists hypothesize that the left hemisphere of a dog's brain can process and respond to familiar words, while the right hemisphere of the brain will respond to the intonation.
Answer: The correct answer is : They must have separate compressed air tanks to fill their air reservoirs
Explanation: Modern air rifles used for small game have a small tank of compressed air integrated in the gun. Large caliber air rifles are designed to hunt larger games. Depending on the weight of the projectile, you can usually make multiple shots before filling each air tank.