Note the presence of air sacs (воздушные мешки) which enable double respiration.
Comparing the skeletons or organ systems of different vertebrates. rabochaia tetrad po biologii 7 klass stranitsa 87 zadanie
If you are using the blue "Line of Life" (Линия жизни) series, page 87 usually covers or rabochaia tetrad po biologii 7 klass stranitsa 87 zadanie
Could you provide the or the topic heading at the top of page 87? This will allow me to give you the exact text and diagram labels required. rabochaia tetrad po biologii 7 klass stranitsa 87 zadanie