2. Formation of earth and origin of life

Question 1

What is a protoplanetary disk

Answer 1

rotating cloud of dust and rocks made in the big band

Question 2

When was thr protplanetory disk destroyed?

Answer 2

4.6 bilion years ago in the supernova

Question 3

How was the sun created

Answer 3

the protoplanetary disk accelaterated, heated up a

Question 4

How were protoplanets formed

Answer 4

small colliding objects that remained in the disk

Question 5

How were planets formed

Answer 5

smaller objects collided to form larger objects

Question 6

What eons are in the Precambrain super eon

Answer 6

Hadeon eon, archeon eon

Question 7

what did earth look like during the hadeon eon

Answer 7

• no free oxygen, hydrogen and helium gas, molten, no protective atmpsphere

Question 8

How was the atmosphere created?

Answer 8

it was bombarded by asteroids that released steam and gas

Question 9

What did the early atmosphere consist of

Answer 9

ammonia, methane, nitrogen, hydrogen

Question 10

what was the archaeon eon

Answer 10

when unicellular life arose

Question 11

What was early life

Answer 11

stromatolites, bacteria and archea

Question 12

how long ago did unicellular life arise

Answer 12

3 billion years ago

Question 13

what eon did multicellular life arise

Answer 13

prechambrian, Archean

Question 14

what was the first multicellular life

Answer 14

trilobites, hard shell animals

Question 15

how long ago did multicellualr life arise

Answer 15

1 billion years ago

Question 16

what happened in the paleozoic era

Answer 16

cambrian explosion and 1st land plants and animals

Question 17

when did the first land plants and animals arise

Answer 17

the palozoic era

Question 18

what ended the paleozoic era

Answer 18

permian extinction

Question 19

What was the mesozoic era

Answer 19

age of reptiles and dinosours, and first mammals

Question 20

what era was the age of reptiles and dinosours

Answer 20

mesoxoic era

Question 21

when did the 1st mammals arise

Answer 21

mesozoic era

Question 22

what were the first mammals like

Answer 22

rodent like -morhanucodon

Question 23

what ended the mesozoic era

Answer 23

k-pg extinction

Question 24

when was the age of mammals

Answer 24

cenozoic era

Question 25

what are the steps to early life on earth

Answer 25

abiotic synthesis, formation of polymers, formation of protobionts, origin of hereditary material

Question 26

what was the miller urey experiments

Answer 26

reproduced the condtions of early earth

Question 27

what was early life made out of according to the miller urey experiment

Answer 27

amino acid, nucleotides, sugars, lipid, atp

Question 28

what is the importance of clay

Answer 28

formed life since clay is positivley charged it binded with monomers to from protobionts

Question 29

what are protobionts

Answer 29

they are a surrounded membrane that was the precursour to cells

Question 30

what is a polymer

Answer 30

many molecules together, a protein

Question 31

why do we think there was originally an RNA WORLD

Answer 31

easy form abiotically, can replicate itself, has hereditary info, catalytic properties

Question 32

what are viroids

Answer 32

tiny bits of raw dna