Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular, which separates them from bacteria and most protists. They are heterotrophic, generally digesting food in an internal chamber, which separates them from plants and algae. They are also distinguished from plants, algae, and fungi by lacking rigid cell walls. All animals are motile, if only at certain life stages. In most animals, embryos pass through a blastula stage, which is a characteristic exclusive to animals. COUNT 4
QSN1 What sets animals apart from bacteria  and most protists? ANS1 Animals are eukaryotic and multicellular QSN2 What are organisms called that digest food in an internal chamber? ANS2 heterotrophic QSN3 What is another way in which animals are distinguished from plants and algae? ANS3 lacking rigid cell walls QSN4 The blastula stage is a characteristic exclusive to what organism? ANS4 animals