Life Science
Which scenario best shows natural selection?
A. All rabbits randomly change fur color each year
B. Dark‑fur rabbits survive better on dark rocks and reproduce more
C. Rabbits choose their fur color
D. Fur color changes because the weather changes
B. Dark‑fur rabbits survive better on dark rocks and reproduce more
Water at a higher temperature has molecules with:
A. More kinetic energy
B. Less kinetic energy
C. No motion
D. Identical energy to cold water
A. More kinetic energy
Earthquakes happen mainly because:
A. Weather changes
B. Volcanoes cool
C. Oceans evaporate
D. Tectonic plates move
D. Tectonic plates move
To improve sound clarity, engineers might:
A. Add insulation to reduce vibration noise
B. Remove all materials
C. Block the speaker
D. Reduce amplitude
A. Add insulation to reduce vibration noise
Water flows downward from a rain barrel because of:
A. Magnetism
B. Gravity
C. Electricity
D. Wind
B. Gravity
What is one major role of a marsh in an ecosystem?
A. Producing earthquakes
B. Filtering water and providing habitat
C. Increasing global temperatures
D. Blocking all species from entering
B. Filtering water and providing habitat
H₂O₂ contains:
A. 1 hydrogen, 2 oxygen
B. 2 hydrogen, 2 oxygen
C. 2 hydrogen, 1 oxygen
D. 4 hydrogen, 2 oxygen
B. 2 hydrogen, 2 oxygen
Lunar phases are caused by:
A. Earth’s shadow
B. The Moon’s position relative to Earth and Sun
C. Clouds
D. Tides
B. The Moon’s position relative to Earth and Sun
Which step comes first?
A. Form a hypothesis
B. Analyze data
C. Draw conclusions
D. Communicate results
A. Form a hypothesis
Removing a predator usually causes prey populations to:
A. Increase
B. Decrease
C. Stay the same
D. Disappear
A. Increase
Asexual reproduction results in offspring that are:
A. Genetically identical to the parent
B. A mix of two parents
C. Always larger than the parent
D. Unable to reproduce
A. Genetically identical to the parent
If two objects move at the same speed, the one with more mass has:
A. Less kinetic energy
B. No kinetic energy
C. Equal kinetic energy
D. More kinetic energy
D. More kinetic energy
The oldest rock layer is found:
A. At the top
B. In the middle
C. At the bottom
D. Randomly mixed
C. At the bottom
A phone lowering brightness in sunlight is an example of:
A. Input
B. Output
C. Feedback
D. Constraint
C. Feedback
A model is useful because it:
A. Replaces the real object
B. Is always exact
C. Never changes
D. Helps explain or predict something
D. Helps explain or predict something
Two species with very similar embryos likely:
A. Live in the same habitat
B. Eat the same food
C. Have identical DNA
D. Share a recent common ancestor
D. Share a recent common ancestor
A compass needle moves near a wire because:
A. Electricity creates a magnetic field
B. The wire vibrates
C. The compass is broken
D. The wire heats the air
A. Electricity creates a magnetic field
Olympus Mons is:
A. A mountain on Earth
B. A volcano on Mars
C. A crater on the Moon
D. A star
B. A volcano on Mars
A constraint for a moving company might be:
A. Customer satisfaction
B. Truck size limits
C. Advertising
D. Employee uniforms
B. Truck size limits
Which is a chemical change?
A. Ice melting
B. Water boiling
C. Wood burning
D. Cutting paper
C. Wood burning
A dog using its ears to hear involves which system?
A. Digestive
B. Circulatory
C. Nervous
D. Excretory
C. Nervous
To make a phone speaker louder, engineers should:
A. Reduce vibrations
B. Increase the amplitude of sound waves
C. Block sound waves
D. Remove the speaker cover
B. Increase the amplitude of sound waves
Large volcanic eruptions can:
A. Cool Earth by blocking sunlight
B. Warm Earth
C. Stop seasons
D. Change Earth’s orbit
A. Cool Earth by blocking sunlight
Which is the correct order?
A. Test → Build → Plan → Modify
B. Plan → Build → Test → Modify
C. Build → Modify → Test → Plan
D. Test → Plan → Modify → Build
B. Plan → Build → Test → Modify
A graduated cylinder measures:
A. Mass
B. Temperature
C. Force
D. Volume
D. Volume