Hello! I believe you are asking what a Cell wall Is.
Answer:
<em> A rigid layer of nonliving material that surrounds the cells of plants and some other organisms.</em>
Explanation:
A cell wall is<u><em> a sturdy outer layer of protection of the plant cell. It protects the cell membrane and other organelles from the environment, bacteria, and viruses</em></u>. It is composed of cellulose, lignin, and suberin interspersed with carbohydrates and proteins.
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Explanation:
The cross-sectional area of the specimen is calculated as follows.

= 
=
Equation of stress is as follows.

And, the equation of strain is as follows.

Hence, the Hook's law is as follows.
E = 
E = 
= 
or,
= 
= 0.6554 m
or,
= 655.4 mm
Thus, we can conclude that the maximum length of the specimen before deformation if the maximum allowable elongation is 0.48 mm is 655.4 mm.
Answer: A
Explanation: Im pretty sure it's A, if you're desperate, go ahead and take my advice. If you're not you probably shouldnt.