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As far as I'm aware hard shelled eggs come from the evolution of spawn.
On becomming land animals it was unsafe to lay young in water, therefore they replaced spawn with hard shells to incubate the eggs on land.
Look around you'll find the exact answer but those are the basics
What else can I help you with?
Is a chicken struggling to lay eggs if ther is blood on the outer shell?
why does my 12moth old chicken lay a soft shell egg then i see blood on the outer shell
How thick are brown egg shell?
It is the same as a regular chicken shell.
How does the shell of the chicken egg feel?
Well, The shell is rather quite fragile but the shell is a little hard.
If you touch the shell of a chicken will it effect your skin?
No
How does the shell of the chicken grow?
it's formed from calcium - which is given to the chickens in their diet. The shell is formed around the egg during it's passage along the chicken's body.
What part of the Leghorn Chicken's egg is white?
The multilayer hard shell of the egg of a White Leghorn chicken is white. The inside is the same color as every other chicken's egg. The shell is white because the Leghorn does not have the color genes to have blue shells or brown applied to the outer shell layers.
What do chicken eggs look like inside?
chicken eggs are a see through material inside unlike the outside;it's hard shell.
What are the three layers of a chicken egg?
The three layers of a chicken egg are the shell, the egg white (albumen), and the yolk. The shell provides protection, the egg white contains protein, and the yolk is a source of nutrients for the developing embryo.
How are chicken eggs kept from drying out?
Chicken eggs contain a membrane, just under the shell, that holds in moisture.
Parts of chicken egg?
There are actually quite a few parts of a chicken egg. The chicken egg includes the embryo on the inside and the shell on the outside.
Embryo in a sentence?
The embryo of a chicken egg is right below the shell.
How is the outer covering of an egg called?
A shell. Before that the chicken was covering it.
