-Priyanti, Subject Matter Expert at Edumarz
Solution: In order to determine divisions in plants, different characteristics such as the differentiation of their tissues, presence or absence of seeds and flowers and nature of seeds (if present) are considered. Whether or not the plants have a developed vascular system is also taken into account. However, classifying animals into subgroups involve other criteria such as their anatomical and physiological characters (respiratory, digestive, excretory system among others), nature of body cavity, and external appearance of the body such as nature of appendages (if any), body segmentation, etc. In addition, we also consider if the animals are agnatha (jaws absent) or gnathostomata (jaws present); vertebrates or invertebrates; oviparous or viviparous.