WGU D671 Elementary Science Curriculum Complete
Exam Review 2026 | High-Yield Content
1. What is a keystone species in an ecosystem?
A species that is endangered and needs protection.
A species that is at the top of the food chain.
A species that is the most abundant in an ecosystem.
A species that has a disproportionately large effect on its
environment relative to its abundance.
2. Why is it important to ensure that a butterfly garden project aligns with the
curriculum and learning outcomes for elementary students?
It guarantees that the project can be conducted at any time of year.
It ensures that the project supports educational goals and is
suitable for the students' developmental level.
It helps to reduce costs associated with the project.
It allows for more exotic plants to be included in the garden.
3. In a forest ecosystem, if a new species of bird is introduced, which ecological
level would be directly affected by this change?
Population
Community
Biosphere
Niche
4. If two stars are identical in size and luminosity, but one is located 10 light-
years away and the other is 100 light-years away, which star will appear
, brighter from Earth?
The star located 10 light-years away
It cannot be determined without additional information
Both will appear equally bright
The star located 100 light-years away
5. Describe how the loss of a keystone species can affect the biodiversity of an
ecosystem.
The loss of a keystone species can lead to a decline in species
diversity and disrupt the balance of the ecosystem.
The loss of a keystone species only affects the species that directly
interact with it.
The loss of a keystone species increases the population of other
species.
The loss of a keystone species has no effect on the ecosystem.
6. What speed would an observer on the platform perceive a passenger sitting
still in a moving train to be moving?
Stationary
Faster than the train
Slower than the train
The same speed as the train
7. What do elements in the same group of the periodic table have in common?
The same number of protons
Similar chemical and physical properties
, The same number of electrons
The same atomic mass
8. What is the primary reason for the apparent movement of the sun across the
sky?
The sun's orbit around the Earth
The gravitational pull of the moon on the sun
The Earth's rotation on its axis
The Earth's orbit around the sun
9. A chemical reaction is best described as when ___ _.
Two substances are mixed together but remain distinct.
At least two chemicals come together to form a new chemical.
None of these answers is correct.
Atoms, the fundamental building blocks of matter, rearrange
themselves into new combinations.
10. Which of the following is an example of how human activities are likely to
increase the impact of natural disasters?
Removal of coastal wetlands and conversion of land to urban areas
reduces natural protection from storm waves.
Developing an agricultural center on the fertile flank of an active
volcano places a greater number of people at risk.
Deforestation and conversion of land to agriculture yield more
frequent flooding events.
All of the above are correct.
, 11. What is the primary consideration when evaluating student activities in
science?
The time it takes to complete the activities
The preference of the teacher for certain types of activities
The number of activities included in the curriculum
The alignment with elementary science standards
12. In the ecosystem described, what is the role of ducks in relation to insects?
Secondary Consumer
Decomposer
Producer
Primary Consumer
13. If a region experiences severe flooding due to poor land management
practices, what strategy could be implemented to mitigate future flooding
risks?
Encourage urban development in flood-prone areas.
Build more dams without considering land management.
Implement sustainable land management practices.
Increase deforestation to create more farmland.
14. Which ecological level studies the interactions between different species
occupying the same area?
population
biosphere
Exam Review 2026 | High-Yield Content
1. What is a keystone species in an ecosystem?
A species that is endangered and needs protection.
A species that is at the top of the food chain.
A species that is the most abundant in an ecosystem.
A species that has a disproportionately large effect on its
environment relative to its abundance.
2. Why is it important to ensure that a butterfly garden project aligns with the
curriculum and learning outcomes for elementary students?
It guarantees that the project can be conducted at any time of year.
It ensures that the project supports educational goals and is
suitable for the students' developmental level.
It helps to reduce costs associated with the project.
It allows for more exotic plants to be included in the garden.
3. In a forest ecosystem, if a new species of bird is introduced, which ecological
level would be directly affected by this change?
Population
Community
Biosphere
Niche
4. If two stars are identical in size and luminosity, but one is located 10 light-
years away and the other is 100 light-years away, which star will appear
, brighter from Earth?
The star located 10 light-years away
It cannot be determined without additional information
Both will appear equally bright
The star located 100 light-years away
5. Describe how the loss of a keystone species can affect the biodiversity of an
ecosystem.
The loss of a keystone species can lead to a decline in species
diversity and disrupt the balance of the ecosystem.
The loss of a keystone species only affects the species that directly
interact with it.
The loss of a keystone species increases the population of other
species.
The loss of a keystone species has no effect on the ecosystem.
6. What speed would an observer on the platform perceive a passenger sitting
still in a moving train to be moving?
Stationary
Faster than the train
Slower than the train
The same speed as the train
7. What do elements in the same group of the periodic table have in common?
The same number of protons
Similar chemical and physical properties
, The same number of electrons
The same atomic mass
8. What is the primary reason for the apparent movement of the sun across the
sky?
The sun's orbit around the Earth
The gravitational pull of the moon on the sun
The Earth's rotation on its axis
The Earth's orbit around the sun
9. A chemical reaction is best described as when ___ _.
Two substances are mixed together but remain distinct.
At least two chemicals come together to form a new chemical.
None of these answers is correct.
Atoms, the fundamental building blocks of matter, rearrange
themselves into new combinations.
10. Which of the following is an example of how human activities are likely to
increase the impact of natural disasters?
Removal of coastal wetlands and conversion of land to urban areas
reduces natural protection from storm waves.
Developing an agricultural center on the fertile flank of an active
volcano places a greater number of people at risk.
Deforestation and conversion of land to agriculture yield more
frequent flooding events.
All of the above are correct.
, 11. What is the primary consideration when evaluating student activities in
science?
The time it takes to complete the activities
The preference of the teacher for certain types of activities
The number of activities included in the curriculum
The alignment with elementary science standards
12. In the ecosystem described, what is the role of ducks in relation to insects?
Secondary Consumer
Decomposer
Producer
Primary Consumer
13. If a region experiences severe flooding due to poor land management
practices, what strategy could be implemented to mitigate future flooding
risks?
Encourage urban development in flood-prone areas.
Build more dams without considering land management.
Implement sustainable land management practices.
Increase deforestation to create more farmland.
14. Which ecological level studies the interactions between different species
occupying the same area?
population
biosphere
