Rabochaia Tetrad Po Biologii 7 Klass Stranitsa 87 Zadanie [Recent]

To provide an accurate answer for page 87 of your 7th-grade biology workbook, it is important to identify which specific author's workbook you are using. In the Russian curriculum, there are several popular versions, and the content on page 87 differs significantly between them.

In this version, page 87 often deals with or Mammals . rabochaia tetrad po biologii 7 klass stranitsa 87 zadanie

They lack a urinary bladder (to reduce weight for flight). 2. Workbook by V.V. Latyushin and V.A. Shapkin To provide an accurate answer for page 87

Birds have a four-chambered heart (четырёхкамерное сердце) and separate blood flows (arterial and venous). there are several popular versions

Note the presence of air sacs (воздушные мешки) which enable double respiration.