Animals are made of animal cells joined together.Those organisms that have animal cells are called eukaryotes.They eukaryotic cells or cells that have a cell membrane and nucleus.Here's a diagram that may help you :)
The outer membrane of a animal cell,or cell membrane,is semi permeable and allows a essential nutrients into the cell. inside the cell, the cytoplasm is gel like substance that suspends the other organells with in the cell and allows for movement.the nucles for the cell contains DNA-RNA which allows the cell to replicate.MitiChondria Provides the energy for cell,and ribosomes assist with replication.