Classification of the simplest animals that don't move was seriously puzzling for the early researchers, and sometimes those animals were classified as plants. At some point, even the minerals were considered to be live-like things because they could grow and retain more or less the same shape.
Classification of the simplest animals that don't move was seriously puzzling for the early researchers, and sometimes those animals were classified as plants. At some point, even the minerals were considered to be live-like things because they could grow and retain more or less the same shape.