The answer for four is frequency.
Galvanizing protects from rust in a number of ways: It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
Answer:
9
Explanation:
mass number = protons + neutrons
= 4 + 5 = 9
Mitochondrial Atp,lysome digest bad things, nucleus contain DNA ribosomes synthesize proteins
The answer is A (The ability to react with oxygen)