Lesson 2: History of Earth's Organism

Question 1

540-485 million years ago

Answer 1

Cambrian Period

Question 2

540-485 million years ago

What were some organisms mentioned in the Cambrian Period?

Answer 2

Trilobites and sponges

Question 3

540-485 million years ago

What did organisms have during this time?

Answer 3

Organisms had hard body parts like shells and spines

Question 4

440 million years ago

Answer 4

Ordovician-Silurian Extinction

Question 5

It was the first mass extinction

Answer 5

Ordovician-Silurian Extinction

Question 6

440 million years ago

What happened during the Ordovician-Silurian Extinction?

Answer 6

First mass extinction of organisms like trilobites, brachiopods, graptolites, bryzoans, and jawless fishes

Question 7

420-350 million years ago

Answer 7

Emergence of trees and animals

Question 8

420-350 million years ago

What changed in the planet?

Answer 8

Greeny ecosystem in the land mass of Earth.

Question 9

250 million years ago

Answer 9

Pangaea

Question 10

250 million years ago

What occured 250 million years ago?

Answer 10

Great Dying of Organisms

Question 11

250 million years ago

What happened in the Great Dying of Organisms?

Answer 11

Greatest mass extinction due to greenhouse gases accelerated global warming

Question 12

240-239 million years ago

Answer 12

Dinosaurs appeared

Question 13

240-239 million years ago

How many years did dinosaurs rule the Earth?

Answer 13

150 million years

Question 14

240-239 million years ago

What were some dinosaurs during this time?

Answer 14

Sauropod Argentinosaurus and T.rex

Question 15

66 million years ago

Answer 15

Asteroid and New Mammals

Question 16

66 million years ago

What did the asteroid do to the dinosaurs?

Answer 16

Asteroid wiped out all the dinosaurs

Question 17

66 million years ago

How did the asteroid wipe out the dinosaurs?

Answer 17

There was so much debris in the atmosphere that it blocked out the sun which led to climate changes, causing the dinosaurs to die.

Question 18

6 million years ago

Answer 18

Sahelanthropus

Question 19

Believed to be the earliest known human that started walking the Earth

Answer 19

Sahelanthropus

Question 20

How did the Sahelanthropus walk?

Answer 20

On four legs

Question 21

4 million years ago

Answer 21

Human starts walking upright

Question 22

1 million years ago

Answer 22

Humans develop tools, discover fire, and human interactions

800,000 discovered things which sparks and 15000 human-like went extinct