The history of life

The history of life

By Bingxue Wang

KEY CONCEPT Multicellular life evolved in distinct phases.

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​Lesson 5 Radiation of multicellular life

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The first three eons were: Hadean, Archean, and Proterozoic. They are better known as Precambrian time.​

Multiple Choice

The earliest forms of life appeared during the

• Paleozoic Era
• Cenozoic Era
• Precambrian Time
• Mesozoic Era

Multiple Choice

The first three eons were: Hadean, Archaean, and Proterozoic. They are better known as:

• PreCambrian Time

• Phanerozoic

• Mesozoic

• Cenozoic

Multiple Choice

Which of the following is the correct sequence of geologic time from smallest to largest unit?

• era, eon, period, and epoch

• epoch, eon, era, and period

• epoch, period, era, and eon

• era, eon, epoch, and period

Multiple Choice

On the geologic time scale, eras are divided in to

• Epochs
• Periods
• Indexes
• Relative dates

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Read this chart carefully. What do you notice about the mass extinction and the borderline of the period?​

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Multiple Choice

What event marks the end of each geologic area?

• 1 million years
• burst of new life forms
• mass extinction
• ice age

Multiple Choice

What is a mass extinction?

• When all the species in a particular area on earth suddenly go extinct
• When multiple species from all over the earth suddenly go extinct 
• When one species goes extinct due to habitat changes
• When all life on earth is wiped out 

​1. When

2. Which group of organisms dominates the era? Age of ......​

3. Which group of organisms appears​ in the Era?

4.Extinction that marks the end of the Era​

​Paleo: old

Meso: middle

Ceno: new​

Multiple Choice

Which of the following correctly lists the geologic time  periods in order from OLDEST to MOST RECENT?

• Precambrian, Mesozoic, Paleozoic, Cenozoic
• Cenozoic, Mesozoic, Paleozoic, Precambrian
• Precambrian, Paleozoic, Mesozoic, Cenozoic
• Mesozoic, Paleozoic, Precambrian, Cenozoic

• 544 mya - 248 mya

• Cambrian explosion: huge diversity in marine animals such as sponges, corals, snails, trilobites, fish, and sharks.

• ​Multicellular organisms first appeared

• ​Life moved onto land in the middle of the Paleozoic era. Reptiles appeared

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​Some text here about the topic of discussion.

​Paleozoic era

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• When: The Permian Period of the Paleozoic Era (about 250 million years ago)

• Size of the Extinction: An estimated 96% of all living species eliminated

• Suspected Cause or Causes: Unknown—possibly asteroid strikes, volcanic activity, climate change, and microbes

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​Mesozoic era​

• ​248 mya -65mya

• The Mesozoic era is known as the Age of Reptiles.

• ​Dinosaurs, birds, flowering plants, and first mammals appeared.

• At the end of Mesozoic era, nearly 75% of all living species is eliminated due to extreme asteroid or meteor impact

• ​65mya-

• "The age of mammals". Placental mammals and monotremes evolved and diversified.

• Modern humans appeared late in the era​

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​Some text here about the topic of discussion.

Cenozoic era

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Multiple Choice

"age of marine life"

• Precambrian Era
• Mesozoic Era
• Cenozoic Era
• Paleozoic Life

Multiple Choice

During which Era appeared the earliest reptiles?

• Cenozoic
• Paleozoic
• Mesozoic
• Precambrian

Multiple Choice

The Cenozoic Era is often called "the Age of the ____"

• Dinosaurs
• Mammals
• Amphibians
• Reptiles

Multiple Choice

During which geologic era did trilobites, mosses and ferns first appear in the fossil record?

• Paleozoic
• Mesozoic
• Cenozoic
• Precambrian

Multiple Choice

In what era were dinosaurs the dominant species?

• 
  Cenozoic
• Paleozoic
• Mesozoic
• Quarternary

Multiple Choice

These were the dominant species that existed during the Paleozoic era:

• Dinosaurs and reptiles

• Aquatic life and reptiles

• Dinosaurs and aquatic life

• Ancient aliens