1. Life?

Question 1

What is the protoplanetary disk?

Answer 1

a roataing ball of gases that was produced in the Big Bang

Question 2

When did the big bang occur?

Answer 2

4.6 Billion years ago

Question 3

How did earth form?

Answer 3

Gavity caused matter to condense and objects colided to form larger planets

Question 4

What was the First stage of Earth?

Answer 4

The hadean eon

Question 5

What was the hadeon era like?

Answer 5

• it had no free oxygen
• completly molten
• no protective atmosphere
• mostly hydrogen and helium

Question 6

What caused rain and oceans during the hadeon eon?

Answer 6

as it was bombarded by asteroids, steam and gas was released to form the atmosphere

Question 7

When did early life begin

Answer 7

3.8 Billion Years Ago

Question 8

What was early life?

Answer 8

Unicellular life

Question 9

What are some forms of early life?

Answer 9

Stromatolites like bacteria and archaea

Question 10

What era did multicellular life arise?

Answer 10

Precambrian

Question 11

What are some forms of multicellular life?

Answer 11

Trilobites

Question 12

what was the Cambrian explosion?

Answer 12

an explosion where all major animal groups appeared

Question 13

When did first land plants and animals appear?

Answer 13

the paleozoic era

Question 14

when was the age of reptiles?

Answer 14

mesozoic era

Question 15

What was the cretacous paleogener K-Pg

Answer 15

mass extiction

Question 16

What era did humans and mammals begin emering?

Answer 16

Cenozoic Era

Question 17

How long ago did humans first appear?

Answer 17

65 Million Years ago

Question 18

What epoch are we in now?

Answer 18

Holocene Epoch

Question 19

What happed during the continental drift?

Answer 19

land mass moved but also structure, oxygen moved leading to diversity of evolution

Question 20

what does a geologic clock help us do?

Answer 20

visualize durations and time frames

Question 21

What happened 3.8 billion years ago?

Answer 21

Life began

Question 22

What happened 3.8 billion years ago?

Answer 22

Life began

Question 23

What is panspermia?

Answer 23

The idea that life came from another place

Question 24

What are the characteristics of life?

Answer 24

It is organized and it replicates itself

Question 25

What are the four steps to life?

Answer 25

1. Abiotic Synthesis of organic material
2. formation of polymers
3. Formation of protobionts
4. Origin of hereditary material

Question 26

what experiment probed the abiotic synthesis of organic materials?

Answer 26

miller-urey experiment

Question 27

what is abiotic synthesis?

Answer 27

making things without life

Question 28

what are polymers

Answer 28

natural substance that make up materials in living organisms

Question 29

what was the formation of polymers

Answer 29

Amino acids connecting to create protein

Question 30

what was the first polymer

Answer 30

clay - positivley charged with iron and zinc which polymers attracted

Question 31

What ‘type’ of world in first life exist in?

Answer 31

RNA world

Question 32

What is an RNA world ?

Answer 32

• can easily form abiotically
• can replicate itself
• heredity information
• has catalytic properties

Question 33

What were found to be a clue to the RNA world?

Answer 33

Viroids