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Worksheets08 Chapter 14.1 History of life and fossils Bio IB
Total questions: 25
Worksheet time: 22mins
Analyze the seashell found in the white layer. Which statement is true of the rock layer that contains this fossil?
It is older than the layers above it.
It is older than the layers below it.
It is younger than the layers above it.
According to scientific measurements, approximately how old is the Earth?
4,600 years
4.6 million years
4.6 billion years
If you were examining sedimentary rock and saw fossils of many types of organisms in lower layers of rock and found almost no species in areas above a certain point, what would you conclude? Choose the best answer.
There was a major change on Earth that caused a mass extinction
All of the species moved to a new habitat
The dinosaurs caused all of the other species to go extinct
Put these species in order according to the order in which they appear in the fossil record.
prokaryotic cells, eukaryotic cells, sponges, fish, amphibians, reptiles
eukaryotic cells, prokaryotic cells, sponges, amphibians, fish, reptiles
prokaryotic cells, eukaryotic cells, fish, reptiles, amphibians, sponges
What is a half life?
The time it takes for 1/2 of the atoms of a radioactive element to change into another element.
About 50 years since humans can live to 100 years
1000 years
The time is takes for all of the carbon-14 atoms to disappear
Many fossils of large amphibians (related to frogs and salamanders) were found in an area that is currently barren desert. Which is most likely true?
The climate of the area was once much wetter than it is now.
Amphibians were once better at surviving in dry environments.
The amphibians migrated there after a catastrophic event destroyed their habitats.
The amphibians are not native to the area and their bones were brought there by other animals.
What is relative dating?
Dating rocks based on their position in layers of sedimentary rock
Taking your cousin to Burger King
Dating rocks based on their category
Which geological era is being shown in the image?
Precambrian
Paleozoic
Mesozoic
Cenozoic
Which geological era is being shown in the image?
Precambrian
Paleozoic
Mesozoic
Cenozoic
If you are looking at a layer of rock and find a fossil of a bird and a mammal in the same layer, what can you conclude.
The species of bird is older than the species of mammal
The bird and the mammal lived at the same time and in the same place
The bird and the mammal species went extinct
If a radioactive element has a half life of 1 million years, how old is an object that has 25% of the normal amount of the element?
1 million
2 million
3 million
4 million
What element that is common in asteroids is found in sedimentary rock layers that are 65 MY old?
carbon
uranium
carbon-14
iridium
What types of organisms are most common in the Precambrian era?
bacteria and other microbes
dinosaurs
mammals
According to the fossil record, how long ago did the first cells (a type of bacteria) appear on Earth?
1.5 MYA
3.5 BYA
4.6 BYA
4.6 TYA
For most of Earth's history life was confined to ________________ and was ______________.
land; multicellular (many cells)
land; unicellular (one cell)
oceans; unicellular (one cell)
oceans; multicellular (many cells)
If you were using carbon dating to determine the age of a bone, what would you conclude about bones A and B below?
Bone A = 13% of the normal carbon-14
Bone B = 82% of the normal carbon-14
bone A is older than B
bone B is older than A
Bone A and Bone B are the same age
What is pangea?
When all the continents were joined together.
When there were only three continents
When there were 24 different continents
Where was the crater discovered that most likely caused the mass extinction 65 million years ago (this is the one that did in the dinosaurs)?
China
The Middle East
Yucatan Peninsula of Mexico
Antarctica
After the asteroid impact 65 million years ago, what really caused so many species to go extinct over the entire planet?
The dust created by the impact blocked the sun and stopped photosynthesis and disrupted food chains
The extreme heat over the entire planet cooked most animals and plants
The iridium from the asteroid poisoned many species
Why can't carbon-14 dating be used on dinosaur remains?
The remains of living creatures cannot be accurately dated with carbon-14
The carbon-14 isotope did not exist during the age of the dinosaurs.
Dinosaurs were reptiles who had no carbon-14 in their systems.
The amount of carbon-14 in dinosaur fossils will be zero or too low to detect.
How old is a bone that has 20% of the original carbon-14 atoms remaining?
13700 years
40,000 years
5700 years
19400 years
How old is a bone that has 80% of the original carbon-14 atoms remaining?
2000 years
6,000 years
5700 years
19400 years
Scientists have discovered ancient fossils of the same species of animal the west coast of Africa and the east coast of South America. The species on the two continents today are not the same. What is the best explanation for this observation?
the fossils were formed when the two continents were connected millions of years ago.
Animals can easily swim between the two continents.
Animals used to be able to fly much greater distances.
There were ancient airplanes that transported species around the world.
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