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Fill in the blanks

(a) Cork cells possesses———on their walls that makes it impervious to
gases and water.
(b) ——— have tubular cells with perforated walls and are living in nature.
(c) Bone possesses a hard matrix composed of———and ———.
 
a. Cork cells possesses 
on their walls that makes it impervious to gases and water.
b
have tubular cells with perforated walls and are living in nature.

c. Bone possesses a hard matrix composed of 
.
Answer variants:
calcium and Phosphorus
Sieve tubes
Suberin