Show that each of the following algebraic structures is a group.(a) where is multiplication of integers.(b) where and is complexnumber multiplication. (c) where is complex number multiplication. (d) where X is a nonempty set and is the symmetric differenceoperation

Ossification 1. As embryos, the framework that appears to be bone is actually composed of either cartilage or fibrous membranes that have the basic shape of the bones that they will become. th a. Around the 6 week of embryonic life and until adulthood, bone forms around these cartilage and membranous “models.” b. There are two types of ossification which are named based on whether we are replacing cartilage or membranes with bone. 1) Endochondral – cartilage replaced with bone. Most common.