Question

question 9 of 10
what event marks the beginning of earth’s current era?

a. the end of the last ice age

b. the emergence of human life

c. a mass extinction

d. the disappearance of land bridges

Explanation:

Earth's current era is the Cenozoic, which began after the Cretaceous - Paleogene (K - Pg) mass extinction event that wiped out non - avian dinosaurs and many other species. Option A: The end of the last ice age is a more recent event within the Cenozoic and not the start of the era. Option B: Human life emerged well after the start of the Cenozoic. Option D: The disappearance of land bridges is related to glacial and interglacial cycles and not the start of the era. So the event marking the beginning of Earth's current era is a mass extinction.

Answer:

C. A mass extinction