One major type of evidence for loss of biodiversity through geological time and recent human history

Question 1

One major type of evidence for loss of biodiversity through geological time

Answer 1

-Fossil evidence of the Cretaceous-Tertiary mass extinction: a main source of this event includes marine fossils

Marine Fossils
-The dramatic changes to marine fossil record indicate this event was linked to a dramatic change and loss in biodiversity
-Many marine mollusc animals became extinct at or near the boundary
-The diversity of marine life decreased when the climate near the K-T boundary increased in temperature

Question 2

One major type of evidence for loss of biodiversity through recent human history

Answer 2

-10 critically endangered species of bird in Australia
-12% of known species are now considered threatened
-Factors include habitat loss, degradation, invasive species and capture by collectors
-Are among the most visible animals and as such are an indicator for tracking changes to the biosphere
-Declining bird populations confirm that profound changes are occurring on the planet in response to human activity