Giả sử vợ chồng có thêm một người con nữa, quy định gene A-tóc đen, a-tóc hồng, B-mắt đen, b-mắt xanh lục. Hai cặp gene phân ly độc lập. Người con thứ 2 có tóc đen, mắt xanh lục với kiểu gene X, Y. Tìm X và Y”

Ibelieve the answer is a-broad because that is a leafed plant.

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

Yes yes yes very good