Transitions
This is an example of the first tetrapod
Acanthostega
How many mass extinctions have occurred?
5
Which appears first in the fossil record?
a) stromatolites
b) oxygen becomes stable in the atmostphere
c) First multicellular organism
a) stromatolites
The _____________________documents the biodiversity of life-forms throughout the history of life on Earth.
Fossil Record
The variety of life that exists in a particular habitat or ecosystem is known as ________________
Biodiversity
The similarity of the limb structure in multiple species suggests
a) they share a common ancestor
b) evolved slowly
c) live for a long time
d) all grow at different rates
a) they share a common ancestor
65 million years ago, a mass extinction occurred and caused the extinction of dinosaurs. This caused diversity to change and __________________ became the top organisms
mammals
The fossil record shows life started in what environment?
Seas
Provide all the correct statements that explain why the fossil record is considered incomplete.
a) Not all organisms become fossils
b) There were times when fossils didn't form
c) Some organisms are too small to make fossils
d) There are still fossils that haven't been found
a) Not all organisms become fossils
b) There were times when fossils didn't form
d) There are still fossils that haven't been found
The term defined as 4-limbed organism
tetrapod
Select ALL the evidence that supports the idea that four-legged animals came from fish.
a) Select ALL the evidence that supports the idea that four-legged animals came from fish.
b) The embryos and DNA are similar
c) The fossil record shows relatedness
d) They have identical bones
a) Select ALL the evidence that supports the idea that four-legged animals came from fish.
b) The embryos and DNA are similar
c) The fossil record shows relatedness
Of the 5 mass extinctions, how many led to the extinction of at least 75% of all species?
FIVE
Which appears first in the fossil record?
a) first multicellular organism
b) oldest fish
c) trilobite
d) first land plants
a) first multicellular organism
Scientists use uranium-235 to date the age of a specific sample of rocks that contain trace fossils of plant life that are determined to be 352 myo. Identify the false statements.
A) Scientists could use Carbon-14 to find the age of the trace fossils
B) The scientists probably measured the ratio of uranium-235 atoms to lead in the rock sample
C) Scientists were measured the absolute age of the rocks and fossils
D) Scientists were measured the relative date of the rocks and fossils
A) Scientists could use Carbon-14 to find the age of the trace fossils
D) Scientists were measured the relative date of the rocks and fossils
The term defined as a broad span of time based on typical life forms
era
Name the skeletal limb structure found in humans, cats, birds and Pederpes
One bone, two bones, many bones, digits
What are the two MOST common environmental factors that led to multiple mass extinctions?
a) asteroid impact
b) volcanic activity
c) major temperature changes
d) algal blooms
b) volcanic activity
c) major temperature changes
The Cenozoic era is called the age of the ___________________
mammals
The principle of superposition tells scientists this age of rocks or fossils
Relative age
Besides the limb structure, identify THREE additional characteristics of Tiktaalik that made it tetrapod-like
1. ribs that interlocked
2. hip bones
3. lungs
4. neck
5. flat head with eyes on top
What % of all organisms that ever lived are now extinct
99%
The mass extinction at the end of the Cretaceous period ended what era?
Mesozoic era
What information do you need to find the precise age of a dinosaur fossil?
The absolute age of the rock the fossil is found in
This is the term used for a species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically
keystone species