Fossils & Early Earth

Question 1

Evolution

Answer 1

change over time

Question 2

Fossils

Answer 2

preserved remains of ancient organisms

Question 3

Extinct species

Answer 3

those that have died out

Question 4

Paleontologist

Answer 4

researchers who study fossils to learn about ancient life

Question 5

Biogeography

Answer 5

study where organisms live now and where their ancestors lived in the past

Question 6

What are the major divisions?

Answer 6

Eons, Eras, and Periods( Epoch)

Question 7

How old is the Earth?

Answer 7

4.5 billion years old

Question 8

Where are fossils preserved?

Answer 8

build up of sedimentary rock

Question 9

Miller and Urey results in them trying to recreate Earth’s conditions:

Answer 9

. Showed info of amino acids
.Organic compounds could be synthesized
.Experiment was WRONG

Question 10

oxygen X iron =….?

Answer 10

rust

Question 11

Endosymbiotic theory

Answer 11

proposes that eukaryotic cells formed a beneficial relationship among several different prokaryotic cells

Question 12

Half- life

Answer 12

Time required for half of the radioactive isotope to decay

Question 13

What 2 things does the endo. theory give?

Answer 13

. Development of eukary. cells that lead to numerous kinds of multicellular organisms
. Sexual reproduction - more life diversity

Question 14

How did the 1st forms evolve?

Answer 14

without oxygen

Question 15

How do they date the fossils?

Answer 15

by absolute & relative dating

Question 16

Earth’s early atmosphere:

Answer 16

little oxygen
mainly CO2, nitrogen, water vap.
small amt: carbon monoxide, hydrogen sulfide, & hydrogen cyanide

Question 17

What is the most important source of info?

Answer 17

fossils

Question 18

How did ocean go from brown to blue/green?

Answer 18

rust form bond at bottom of ocean.

Question 19

What first started to produce oxygen?

Answer 19

photosynthetic bacteria