Fossils/Extinction
Paleontologists discovered fossils of a species in several rock layers, but the fossils suddenly stopped appearing in younger rock layers. What does this most likely indicate?
What is "They went extinct at this time"?
What happens to the strength of a magnetic field as the distance from the magnet increases?
What is decreases?
A scientist is testing analog and digital signals by sending both through the same noisy communication channel. The digital signal arrives with all information intact, while the analog signal is distorted. Based on this scenario, which statement best explains why the digital signal is more reliable
What is: Digital signals can be corrected using patterns in the data, even if some parts are distorted?
In a population of lizards in a forest, some are green, and some are brown. If the forest is cleared for grassland, which statement about this variation is true regarding the change in the environment?
What is: The green lizards will have an advantage in the grassland?
A passenger sitting on a moving train looks out the window and sees another train moving in the opposite direction. Why does the second train appear to move faster than it really is?
What is: Because motion depends on the observer’s frame of reference
Why are rapid geologic changes, such as volcanic eruptions or asteroid impacts, more likely to cause extinction than slower changes?
What is: Species cannot adapt quickly enough to survive drastic habitat changes like they can when changes are slower.
A student design team is testing different electromagnets to lift metal objects. Their goal is to lift heavy objects without making the magnet larger. Name a design change that would help them meet this goal.
What is:
Use a stronger power source to increase the current
What is: cosmic microwave background radiation?
OR: redshift (proof that galaxies are moving away from each other), composition of the universe (Hydrogen and Helium are most abundant), or math to prove the universe had a beginning point.
Scientists observe that whales, cats, bats, and humans all have limb bones with similar arrangements, even though they use them differently. This observation supports the idea that...
What is: The species inherited these structures from a common ancestor, but the limbs evolved different functions.
A swimmer pushes hard against the wall of the pool and moves forward through the water. How do you explain why the swimmer moves forward?
What is: the wall pushes back on the swimmer with an equal and opposite force.(AKA Newton's 3rd Law of Motion)
Geologists discover a thin rock layer rich in iridium, a metal rare on Earth but abundant in asteroids, found around the world. What concept does this evidence support?
If the electric charges of two objects increase while the distance between them remains constant, what happens to the electric force?
What is: it increases?
How do seismic waves help scientists model Earth’s interior?
What is: waves change speed as they move through different layers?
DNA analysis shows that humans and chimpanzees share about 98% of their genetic material. What does this evidence most strongly suggest about their evolutionary history?
What is: They share a recent common ancestor.
Why is an atom considered to be made up of mostly empty space?
What is: Electrons occupy a large area around a small, dense nucleus.
A scientist compares fossil records from multiple continents and finds identical marine species in widely separated areas. Which hypothesis is best supported by this evidence?
What is: The continents were once connected?
What are changes students could make to increase the strength of an electromaget?
What is
Increasing the current through the wire because more current produces a stronger magnetic field?
OR: wrapping more loops of copper wire around the iron nail, decreasing the distance between the magnet and the items you're trying to pick up
Give a difference between mechanical and electromagnetic waves.
What is: only electromagnetic waves can travel through a vacuum?
What do you call the process in which humans select plants with desirable traits to reproduce to change crops over time?
What is artificial selection?
Correctly name the charges of the three main subatomic particles.
What is: protons are positive, neutrons are neutral, and electrons are negative.
What evidence best supports the theory that continents were once connected?
What is: Similar fossils have been found on different continents?
What happens to the gravitational force between two objects if the distance between them doubles?
It decreases to one-fourth of the original force.
What is: As wavelength increases, frequency decreases.
What is the name of the phenomenon that causes changes in a population over time, which increases the number of individuals with traits that improve survival and reproduction.
What is natural selection?
Which factors are needed to fully describe an object’s velocity
What are speed and direction?