The Cambrian explosion is a remarkable period in world fossils history. It is the period when all the varieties of animal phyla were first noted. (Darroch et al., 2019, p. 659). Scientists have tried to review the whole concept to get a proper explanation of the Cambrian explosion. Studies have developed environmental evolution, genetically, and ecological reasons for the process by linking each aspect to its role in phyla animal origin. Considering the onset of the radiation can be related to environmental evolution (Zhuravlev & Wood 2018, p. 8). In terms of the period it took, the explosion seems to be controlled by developmental innovation. The uniqueness of the process is related to ecological saturation. Charles Walcott, a paleontologist, was the first to identify the unique fossil discoveries in the rocks. Over sixty thousand specimens were discovered in the proceeding research, and about one hundred and seventy species were detected. It is believed that before fossilization, the species stayed under warm and well-oxygenated water, making them be preserved well. Later on, these animals were swept into deeper waters and buried under sediments (Steele et al., 2018, p.18). Burring them in regions of insufficient oxygen supply protected them against predators. Then there emerged new animals with diverse body forms that could bio-mineralize substantial body parts such as exoskeleton. Many scientific fields have now majored in exploring the massive diversification of animals, which has improved the process. Recent discoveries have proven that the radiation resulted majorly due to environmental evolution. Increase oxygenation of the ocean, changes in the chemical composition of the sea, and deposition of methane into the environment caused ecological hostility. In the attempt to adapt, the new environmental diversification intensified. The then available species tried to modify their bodies to have defense mechanisms. Massive extinction of many species was experienced because they failed to adapt. Developmental genes primarily regulate animal diversification. Research done on the modern metazoan reveals that their developmental genes have about twenty genes which account for a fraction of all the genes (Daley et al., 2018, p. 5328). It is suggested that the bilateral developmental system and Hox genes expansion led to the Cambrian explosion and animal diversification. The Hox genes are the earliest discovered developmental genes, with each ancestral metazoan having two Hox genes. Molecular clock and fossil proof show that the bilaterians’ developmental system was in existence before phyla’s first appearance. Therefore, the ecological explanation of the Cambrian explosion is becoming more common. The predator-prey development is the most explained ecological factor of animal diversification. This led to new adaptive strategies such as skeletonization, camouflaging, and venous attacks. Consequently, the animals’ morphological function diversified to help the animal defend itself against aggression (Cai et al., 2018, p. 388). The ecological explanation, however, is questionable because of the confound repercussions with causes. It is argued that feedback mechanis