Xylem tissue is composed of vessel cells and tracheids. Vessel cells lack end walls and join to form long tubes. Tracheids are slender cells with over lapping ends. This structure enables it to give support to the tree as well as moves water to aerial parts.
The code word is A?........
Answer:
Their future children can have blood group AB, O, A or B
Explanation:
since the husband had blood group= Heterogeneous A means AO
and,
the wife's blood group= Heterogeneous B or BO
- so by crossing between them, we get this result.