Thinner walls with valves; carry blood toward the heart.
In this edition, Page 46 often focuses on . gdz po biologii 8 klass rabochaja tetrad 46 stranica
1. Workbook by Kolesov, Mash, Belyaev (Колесов, Маш, Беляев) Thinner walls with valves; carry blood toward the heart
Conducts air and serves as the organ for voice production (contains vocal cords). Thinner walls with valves