Answer: The cells have nucleus and membrane bound membranes.
The cells have a organelle known as nucleus.This is a double membrane bound structure found in the cell. This organelle contains all the genetic information in the form of genetic codes.
The information is carried from the parents to another generation. This is a main characteristic feature of animals.
The cell contains many membrane bound organelles such as mitochondria, Golgi body, ribosomes et cetera.
Hence, all the animals have membrane bound organelles and nucleus inside it.