This group of animals is known as marsupials. It includes animals such as the kangaroo, Tasmanian devil, wombat, koala, wallaby, quoll, bilby etc.
These insects either have hemimetabolous development, and undergo an incomplete or partial metamorphosis, or holometabolous development, which undergo a complete metamorphosis, including a pupal or resting stage between the larval and adult forms. In hemimetabolous insects, immature stages are called nymphs.
The immature form of an animal such as a tadpole is called larva.
penis
Most furry animals are considered fairly cute when immature. Well-known examples include puppies, kittens, chicks, ducklings, and kits (immature rabbits).
The germinal vesicle is a large, prominent nucleus found in the immature oocyte (egg cell) of female animals. It contains the genetic material of the cell and is essential for the early stages of oocyte maturation and development.
The differentiation of stem cells is not limited to immature animals. Stem cells have the ability to differentiate into specialized cell types in both immature and mature animals. However, the potential and efficiency of differentiation may vary depending on the developmental stage and the specific type of stem cell. In general, embryonic stem cells have a greater capacity for differentiation compared to adult stem cells, which may have more limited potential to differentiate into specific cell lineages.
As larval they are immature animals and undergoes metamophosis, e.g., tadpole.
Mollusks, sponges, and coral are among the "animals" that remain relatively stationary.
food
An acephalocyst is a larva filled with fluid, found in the tissues of man and lower animals, the immature stage of certain tapeworms.
animals
Animals that have internal development include mammals, birds, reptiles, and some fish. These animals give birth to fully formed young ones after the internal development process, where the embryo develops inside the mother's body. This allows the young ones to be born in a more advanced state compared to animals with external development.