Question

1. Which period represents the last 2 million years of geologic time?

Answer 1

I believe the answer is:

1. B. The Quarternary

During the quartenary period, continental ice sheets started to decayed and gradually gone. This made many mammals who have excellent physical structure to survive in the environment such as mammoth,  saber-toothed cats, and glyptodonts started to extinct.

2.  A. Plate interactions

The plate interractions on from inside the earth caused the land structure on the earth surface began to change, which lead to the creation of mountains , volcanoes, etc. When the movement of plates create friction with one another, it would most likely resulted in earthquakes on the earth's surface.

3.  C.  "Age of Mammals"

Age of mammals refers to the geologic age when the mammals are considered to be placed on the highest hierarchy on lands. The age started around  65 million years ago, after dinosaurs (which are reptiles) started to extinct.

Answer 2

1. The Quarternary period represents the last two million years of geologic time.
2. The correct answer in this question is option A. Plate interactions caused many events of mountain building, volcanism, and earthquakes in western North America during the Cenozoic.
3. The current geologic age is option C which is the "Age of Mammals"