We’d have to be very careful because if we had our skeletons on the outside it’d be very easy to injure ourselves
Answer:
attached here is the diagram of the solution
Explanation:
Answer: The correct option is 3.
Explanation: We are given a compound which is made up of iron and oxygen only. The ratio of the two are given as:

This means that, number of iron ions are 2
Number of oxide ions are 3
From the above information, the formula becomes : 
The valency of iron = 3
Valency of oxide = 2
This compound is named as iron (III) oxide.
Hence, the correct option is 3
Answer:
NaHCO3 → H2O + CO2 + Na2CO3
Explanation:
The answer is B. Unit cell.
Hoped I Helped!