an egg shell is composed of CaCO3 but how a 10th class CBSE student is

1.	an egg shell is composed of CaCO3 but how a 10th class CBSE student is supposed to know this? where is this exactly given?
Answer» ong>Answer: ACTUALLY we LEARNT this in 5th or 6th standard I THINK

an egg shell is composed of CaCO3 but how a 10th class CBSE student is supposed to know this? where is this exactly given?

Answer»

ong>Answer:

ACTUALLY we LEARNT this in 5th or 6th standard I THINK