Qaysi hayvonlar tipining vakillarida qon aylanish sistemasi vakillarida qon aylanish sistemasi ochiq (1), yopiq(2)?
a)halqali chuvalchanglar; b)mollyuskalar; c)bo’g’imoyoqlilar; d)xordalilar

1. 1-a, d; 2-c,c
2. 1-b, c; 2-a,d
3. 1-a; 2-c,b,d
4. 1-b; 2-a, c, d
5. hammasi