What is the character of earths past mass extinction events and how does it bear on modern biodiversity

) What is the character of earth’s past mass extinction events and how does it bear on modern biodiversity? Provide examples and graphics in your response. The past mass extinction events of the earth is characterized by great loss in species due to events such as dramatic fluctuations in the sea level, global cooling leading to loss of oxygen in the oceans, impact from asteroid or comets, severe volcanic eruptions and global warming among others. The mass extinctions took place several millions of years ago and the after effect has been a significant transformation in biodiversity. For example, the Triassic-jurassic Extinction that happened 210 million years ago allowed dinosaurs to flourish while other organisms including some vertebrates went extinct. It is also important to appreciate that during the mass extinction of the dinosaurs that occurred around 65 million years ago due to massive volcanic eruptions, humans were able to survive as they hid from the eruptions.