Placids can be defined as the endosymbiotic organelles, which substantially rely on the cell of their hosts to survive. Even so, placids are reported to have shown so much diversity in different situations. Therefore, ways through which differences emerge has been addressed. Some of the aspects that contribute to these differences are such as the difference in the lineages from which plastids originated. This is evident given that there are primary and secondary lineages from which the plastids can stem from. Additionally, the cause for the small size of the plastids has been established. Plastids are ...