Question

an animal that does not contain a nucleus

Answer 1

prokariotic organisms like bacteria

They have nuclioid instead of nucleus

Answer 2

Red blood cells are does not have a nucleus in its maturity . So these are called enucleated cells. These are presented in blood of animals.all animal rbc cells are enucleated except camel rbc cells. RBC ‘s are formed at bone marrow with nucleus but these are going to maturity gets enucleated by the process called enucleation.