Answer: SECONDARY CELL WALL.
Explanation: When cell wall grow,it becomes thickened,then it further deposits new layers of a different material (different from that of the primary cell wall) from where secondary cell wall is formed.
This secondary cell wall is made up of cellulose,hemicellulose,and lignin.
They function in providing additional strength,support, rigidity to cells and the larger plant.
Macromolecules, hope this helps.
The answers are: condense; visible
Explanation:
In Prophase I, the chromosomes condense and become visible.
Answer:
colds are cause by viruses