WorksheetsEvolutionary History Test try 2
Total questions: 24
Worksheet time: 20mins
What does it mean when two species share body structures? Choose the correct answer.
They are not related
They may be descended from a common ancestor population
They evolved independently
They cannot share structures.
Species that share structures can have differences because they have been in ______ environments and have changed in different ways over time.
separate
identical
controlled
artificial
Differences in shared structures may be evidence that species had a common ancestor population that was separated into different environments because:
They evolved similar traits independently.
They inherited these structures from a common ancestor and adapted them to different environments.
They have no evolutionary relationship.
They developed these structures randomly.
According to the passage, what does it mean when two species share body structures?
They are not related at all
They may be descended from a common ancestor population
They evolved in the same environment
They cannot have differences in their structures
Body structures that are unique to a group of species but are not shared by other species provide evidence that all species with that structure share a common ancestor that is more ______ than the common ancestor they share with the species that do not have that structure.
recent
ancient
distant
primitive
Differences in shared structure may be evidence that species had a common ancestor population that was separated into different environments.
True
False
SC1: Two species that share a later branch point on an evolutionary tree are more closely related to each other.
True
False
SC2: Body structures stay stable in stable environments, and change in changing environments.
True
False
Similarities and differences in body structures can be used to interpret evolutionary relationships by:
Comparing anatomical features to find common ancestry
Ignoring physical traits and focusing only on behavior
Assuming all organisms are unrelated
Relying solely on environmental factors
How could Flor explain why all three species share some body structures and have some differences? Why do only house geckos and Pacific gulls have two temporal holes in their skulls?
Because they share a common ancestor but have evolved differently; only house geckos and Pacific gulls inherited two temporal holes from a more recent common ancestor.
Because they live in the same environment; only house geckos and Pacific gulls adapted to have two temporal holes for better hearing.
Because they are all reptiles; only house geckos and Pacific gulls are birds with two temporal holes.
Because they have similar diets; only house geckos and Pacific gulls need two temporal holes for eating.
The house gecko, Pacific gull, and wolf have similarities and differences in their body structures. These similarities and differences can be used to determine which two species are more closely related to each other by comparing their:
Body size
Habitat
Structural features and evolutionary history
Color patterns
Why do the three species have similarities and differences in their body structures, and how can Omar use the structures to determine if the new fossil is more closely related to horses or three-toed sloths?
Because they share a common ancestor, and Omar can compare the body structures to determine which species the fossil is more closely related to.
Because they live in the same environment, and Omar can use their diet to determine the relationship.
Because they have similar behaviors, and Omar can use their size to determine the relationship.
Because they have the same lifespan, and Omar can use their color to determine the relationship.
According to the passage, why do some species share structures such as seven vertebrae in the neck?
Because they live in the same environment
Because they are descendant species of a common ancestor population
Because they have the same diet
Because they are the same species
The ancestor population passed on the structure of ______ vertebrae in the neck to the descendant species.
seven
five
ten
four
According to the passage, what can Omar conclude if a new fossil shares the one-toe-on-each-foot structure with horses, but not with three-toed sloths?
Omar can conclude that the new fossil is more closely related to horses because they share a more recent common ancestor with each other than with three-toed sloths.
Omar can conclude that the new fossil is more closely related to three-toed sloths because they both have a unique evolutionary trait.
Omar can conclude that the new fossil is equally related to both horses and three-toed sloths because they all have toes.
Omar can conclude that the new fossil is not related to either horses or three-toed sloths because it has a different structure.
What does the presence of shared body structures between species indicate about their ancestry?
It indicates the possibility of descent from a common ancestor.
It proves that the species are identical in every way.
It shows that the species evolved at the same time.
It means the species cannot interbreed.
How do species inherit physical traits according to the inheritance mechanism described in evolutionary biology?
What is the impact of different environments on shared body structures in species?
Different environments exert different selective pressures, leading to variations in shared structures.
All species with shared structures will always look identical regardless of environment.
Environments have no effect on the development of shared body structures in species.
Shared body structures are only influenced by genetic mutations, not by the environment.
What drives the divergence of physical traits as species adapt to their unique environments?
How do differences and similarities in shared structures help scientists understand evolutionary relationships?
Structures remain stable in unchanging environments but can evolve significantly in response to _________?
environmental shifts
constant temperatures
static conditions
unchanging climates
What does a branch point on an evolutionary tree represent?
A recent common ancestor
A unique structure
A species that diverges at a later point and is more closely related
An environmental factor
The presence of unique structures within a group of species but absent in others points to a more recent ________ for the former group compared to those lacking the unique trait.
common ancestor
evolutionary gap
environmental adaptation
mutation event
By analyzing shared physical structures, scientists can uncover the evolutionary history of species and construct a more detailed picture of life's history.
True
False
