Using tables 2.1 and 2.2 as references, fill out the following table. The first item is given as an example.   Table 2.6: Some Important Events in Geologic Time Event Eon Era Period Epoch Age of Reptiles begins Phanerozoic Mesozoic Triassic ____ Beginning of the Age of Mammals             Early humans first appear             Eukaryotes first appear             First living things appear             Fish with bony skeletons first appear         Formation of Pangaea             Formation of present-day continents         Land plants first appear             Modern humans first appear

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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.