Answer:c
Explanation:
softwood is used in doors roofs and so on
Answer:
A
Diameter He = 0,1 nm.
Km to nm:
⇒ Diameter He = 1.0 E-13 Km * ( 1000 m / Km ) * ( 1 E9 nm / m )
⇒ Diameter He = 0.1 nm