The animals body plans that emerged from the Cambrian Explosion were multi-cellular and significantly larger than animals that predated the Cambrian. This required the ability to use the process of aerobic respiration to more efficiently break down food molecules. What are two milestones that occurred in the Eon(s) that predated the Cambrian explosion that allowed for this more efficient form of energy production? (List both the milestone and the Eon in which it occurred)

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Marine Evolution

Marine habitat is less explored, and hence, its biological diversity is far less known. The marine habitats are not constant due to their shifting nature, while the terrestrial habitats are more stable. Marine biology is the science that deals with the study of diverse marine species, their interactions, and behavioral characteristics.