Birds have a four-chambered heart (четырёхкамерное сердце) and separate blood flows (arterial and venous).
In this version, page 87 often deals with or Mammals . 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 please check the following: (Pasechnik
Describing food chains or the role of animals in a specific biocenosis. Key Answers: Producers (plants) →right arrow Primary Consumers (herbivores) →right arrow Secondary Consumers (predators). How to confirm your assignment: etc.) What is the topic? (e.g.
Since assignments can vary by edition year, please check the following: (Pasechnik, Latyushin, Ponomareva, etc.) What is the topic? (e.g., " Birds ," or " Mammals ") What is the task number? (e.g., Task #125 or #150)