What is the eggshell made up of?

Answer 1

When an egg is fertilized you can see a round whitish dot on the yellow yoke. This means the egg can develop into a chick, if you have a hen that will brood it (sit on it). Or you can incubate the egg for 21 days to hatch the chick.

So to answer your question, that white dot starts developing into a chick and slowly consuming the whole inside of the egg for nutrition. That's the reason chicks can be mailed via the post office to people all over the country. The nutrition the chick consumed within the egg holds it over for a few days after hatching.

Answer 2

It's the hard and yellowish shell/hard outer covering of the egg yoke and egg white.

Answer 3

Basicaly it is made of calcium and its compounds

Answer 4

calcium carbonate , powdered used for broken bones :)

Answer 5

the yoke