What is an egg?
Q: What is an egg?
A: An egg is a container for the zygote resulting from the fertilization of an ovum.
Q: What does the egg do for the zygote?
A: The egg protects the zygote and feeds the embryo.
Q: When does the egg hatch?
A: The egg hatches when the animal embryo develops until it can survive on its own.
Q: Do all animals lay eggs outside the mother's body?
A: Yes, most vertebrates, arthropods, and mollusks lay eggs outside the mother's body.
Q: What are the types of containers or coverings for eggs in animals?
A: The types of containers or covering for eggs in animals are a shell or covering.
Q: What is special about cleidoic eggs and which animals lay them?
A: Cleidoic eggs are a special kind of egg with a good supply of food and water that have an outside covering which allows gases in and out. Reptiles, birds and monotremes lay cleidoic eggs.
Q: How do simpler eggs differ from cleidoic eggs?
A: Simpler eggs, laid by fish, amphibians, insects, and arachnids, are less protected, with much less nourishment.
