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WorksheetsAdaptations Unit 2 Review
Total questions: 28
Worksheet time: 21mins
What is the most primitive (simple) organism shown on the diagram?
Branching Tree diagrams are constructed by grouping organisms together based on their____________.
similar characteristics
different characteristics
fossil layer
opposite characteristics
As time progresses organisms become more ______________.
simple
Complex
devolved
unrecognizable
What can scientists learn from studying the relationships between fossils?
how old all rock layers are
how life changed over time
how many relatives fossils had
The earliest life forms were
dinosaurs
single-celled organisms
fossils
vertebrates
These images represent the limbs of extinct organisms found in the fossil record. Choose the answer that puts them in order from oldest (most ancient) to youngest (most recent).
Z, Y, W, X
X, Z, Y, W
Z, X, Y, W
Y, W, X, Z
Which of these best describes an evolutionary common ancestor?
a modern-day species that has many related species living today
an ancestral species that is shared by multiple modern-day species
According to scientists, whales are more closely related to lemurs than to clownfish.
Which evolutionary tree correctly shows the relationship between whales, lemurs, and clownfish?
Species that share a common ancestor in the more ______ past are more closely related.
distant
recent
Which diagram best depicts a mass extinction event?
What term do scientists use to describe what happened at each of the marked points on the graph?
Mass Extinction
Minor Extinction
Adaptive Radiation
Increased Biodiversity
When comparing the DNA (traits) of two different organisms, the more differences in the DNA (traits) the more-
Closely related they are.
Distantly related they are.
It doesn't prove anything.
They look alike.
What can be concluded from the diagram shown?
The more closely related the organisms are, the easier it is to tell them apart at an early embryonic stage.
The more closely related the organisms are, the harder it is to tell them apart at an earlier stage.
All organisms are equally related, and can be told apart from an early stage.
None of the organisms are related, and can be told apart at all stages.
Analyze the top row of embryos. Many of these organisms have very similar features like gill slits and tails. Why might these embryos share common characteristics?
The similarities in the embryos in different organisms show there was once a common ancestor.
Embryos are too different from one another for there to have been a common ancestor.
Embryos have too many similarities and too many differences for a clear connection.
There is no connection between the two.
Why might embryos of different animals look alike early on but develop differently?
Embryos are all the same species
Animals grow into identical adults
They share genes from a common ancestor
The environment changes their features
Do you think these organisms share a common ancestor?
Yes, because they have similar structures.
No, because they have different habitats.
Yes, because they have similar DNA sequences.
No, because they evolved independently.
Since fossils don't contain DNA, how else can scientists figure how closely related organisms are?
They get DNA from other humans to test on those organisms
They look at the physical features of each organism and compare them.
They find the common ancestor
They ask there fellow scientists for the answer
