Use this paragraph: The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is alive.
How many grams of carbon will it have after 5,700 years?
(1 point)
Responses
5 grams
5 grams
40 grams
40 grams
2 grams
2 grams
10 grams
10 grams
Which quantity helps determine the absolute age of rocks and fossils?(1 point)
Responses
the ratio of carbon-12 to carbon-14
the ratio of carbon-12 to carbon-14
the ratio of protons to neutrons in carbon-14
the ratio of protons to neutrons in carbon-14
the difference between the number of protons and neutrons in carbon-14
the difference between the number of protons and neutrons in carbon-14
the difference between the amounts of carbon-12 and carbon-14
the ratio of carbon-12 to carbon-14
When will a fossil be used in finding the absolute age of rocks?(1 point)
Responses
if it existed for a limited period of time and in a small area
if it existed for a limited period of time and in a small area
if it existed for a long period of time and in a wide area
if it existed for a long period of time and in a wide area
if it existed for a limited period of time and in a wide area
if it existed for a limited period of time and in a wide area
if it existed for a long period of time and in a small area
if it existed for a limited period of time and in a small area
Which statement best describes why most individual organisms never fossilized?(1 point)
Responses
Chemicals that fossilize organisms are rare.
Chemicals that fossilize organisms are rare.
Only organisms with hard parts fossilize.
Only organisms with hard parts fossilize.
Conditions for fossilization are rare.
Conditions for fossilization are rare.
Only organisms that lived in the ocean fossilize.
Only organisms that lived in the ocean fossilize.