A frog egg is 1.6 million times larger than a single frog cell. The egg turns into a tadpole during embryonic development.
Amphibians tend to lay their eggs in water, This helps protect the young until the are viable. Swimming is an easier skill than land adaptation so, swimming first.
UM ugh....
Gastrula
The Amniotic egg. Remember, reptiles are believed to have evolved from amphibians. Where do amphibians lay there eggs? - The water. Why? because their eggs are soft. The reptiles are the first to lay the amniotic egg which has a hard shell. If an amphibian tried to lay its egg on land, gravity would squad it because an amphibian's egg is jelly like. With the hard shell of the amniotic egg, reptiles have greater change of reproduction.
egg, larva, pupa, adult
external - They develop externally in an egg.
The oocytes are exceptionally large egg cells of the starfish. They store large amounts of nutrients to support embryonic development.
Cleavage produces the number of cells needed for the future organisation of the embryo, shifts and compartmentalises the egg material and balances out the nuclear and cytoplasmic material. Development is initiated by cleavage.
An organism at an early stage of its development is referred to as an embryo. During this stage, the organism undergoes rapid cell division and differentiation to form various tissue layers and organs. The embryo is crucial for the development of the organism into its final form.
germination
The inheritance of an organism tells cells to differentiate during embryonic development.
Raskolnikov
For example : Cockroach with 3stages , Dragonfly with 3stages and Mealworm Beetle with 3stages etc.....
egg tooth
Compare embryonic growth and fetal development in single and multiple pregnancies, including the incidence of complications and infant mortality.
It is fertilized and then poops.
Nutrients
egg cell