EAPS 100 MODULE 4 EXAM QUESTIONS
AND ANSWERS
Which of the following chapters in geologic time occurred before there were abundant
animals with hard parts? - Answer- Precambrian
A hypothesis that explains how new organisms or new characteristics can appear
suddenly in the fossil record is called - Answer- punctuated equilibrium
What defines the boundaries between each of the three eras in the geologic timescale?
- Answer- two great mass extinctions
What was the Cambrian explosion? - Answer- a time when many different types of
creatures appeared on Earth
What is a possible cause of the extinction event called the Great Dying? - Answer- A
great outpouring of lava at the end of the Paleozoic
Early Earth would have been inhospitable to many life forms of today because -
Answer- the atmosphere lacked oxygen
This figure shows the main subdivisions of the geologic timescale. Which of these is the
Cenozoic? - Answer- A
In which of the following time periods were dinosaurs the dominant creatures? -
Answer- Mesozoic
Which of the following is the earliest (oldest) chapter of geologic time? - Answer-
Precambrian
In which of the following time periods were mammals the dominant type of life? -
Answer- Cenozoic
Which factor would help to ensure survival of one species over another? - Answer-
adaptable to environmental change
Upon what basis were the upper and lower boundaries of he Mesozoic Era defined? -
Answer- abrupt changes in the types of fossils, representing mass extinctions
The first organisms on Earth included - Answer- algae
AND ANSWERS
Which of the following chapters in geologic time occurred before there were abundant
animals with hard parts? - Answer- Precambrian
A hypothesis that explains how new organisms or new characteristics can appear
suddenly in the fossil record is called - Answer- punctuated equilibrium
What defines the boundaries between each of the three eras in the geologic timescale?
- Answer- two great mass extinctions
What was the Cambrian explosion? - Answer- a time when many different types of
creatures appeared on Earth
What is a possible cause of the extinction event called the Great Dying? - Answer- A
great outpouring of lava at the end of the Paleozoic
Early Earth would have been inhospitable to many life forms of today because -
Answer- the atmosphere lacked oxygen
This figure shows the main subdivisions of the geologic timescale. Which of these is the
Cenozoic? - Answer- A
In which of the following time periods were dinosaurs the dominant creatures? -
Answer- Mesozoic
Which of the following is the earliest (oldest) chapter of geologic time? - Answer-
Precambrian
In which of the following time periods were mammals the dominant type of life? -
Answer- Cenozoic
Which factor would help to ensure survival of one species over another? - Answer-
adaptable to environmental change
Upon what basis were the upper and lower boundaries of he Mesozoic Era defined? -
Answer- abrupt changes in the types of fossils, representing mass extinctions
The first organisms on Earth included - Answer- algae
