In science the other day Ani learned about birds and examined an egg. First she looked at the outside of the shell with a hand lens. She could easily see the pores that way.
After she cracked open the egg she looked at the membrane inside the shell and filled half the shell with water. This showed her how the pores let oxygen pass in and out of the egg, but keep water inside.
Then she examined the egg itself. She saw the three different layers, the yolk, the thick white, and the runny white and identified what each layer is for. She found the white bit that an embryo would attach to as well.
Finally, she drew a picture of what she had observed and labeled the parts.