What is the exact difference between grades of organization and symmetry? Explain with examples?

Explanation

i.The exact difference between grades of organization and symmetry is that body organization is the arrangement of smaller units into larger ones, whereas body symmetry is the number of symmetrical parts the animal can be divided into.
ii. It can be explained with help of following examples:
a.In Cnidarians, cells come together to form tissues which perform body functions. This type of body organization is called cell-tissue grade organization. However, Cnidarians are radially symmetrical, i.e. when their body is cut through an imaginary central axis of any plane of body, it gives two equal halves.
b. Incase of flatworms, they show tissue organ grade organization, in which tissues are organized to form some organs. These flatworms are bilaterally symmetrical, i.e. there is only one imaginary axis through which one can get two equal halves.