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Science Reasoning Flashcards

7 cards from real CLT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A study examines whether geographic isolation leads to speciation in birds. Researchers find that two bird populations separated by a mountain range have diverged in beak shape over 10,000 years. What scientific concept does this most directly illustrate?

    Answer: Allopatric speciation driven by geographic separation

    Allopatric speciation occurs when geographic barriers prevent gene flow, allowing populations to diverge into distinct species.

  2. A physicist measures the speed of light in a vacuum in three trials: 2.998×10⁸ m/s, 3.001×10⁸ m/s, and 2.999×10⁸ m/s. The accepted value is 2.998×10⁸ m/s. These results are best described as:

    Answer: Both accurate and precise

    The values cluster tightly together (precise) and are very close to the accepted value (accurate).

  3. A student claims that increasing the concentration of a reactant will always increase reaction rate. Which scenario would most directly challenge this claim?

    Answer: An enzyme-catalyzed reaction that plateaus in rate once all enzyme active sites are saturated

    Enzyme saturation creates a maximum reaction rate that cannot be exceeded by adding more substrate, contradicting the 'always increases' claim.

  4. Scientists discover a fossil with characteristics of both reptiles and birds. This find would most directly support which scientific concept?

    Answer: The existence of transitional forms linking evolutionary lineages

    Transitional fossils show intermediate characteristics, providing evidence of evolutionary relationships between lineages.

  5. In a controlled experiment on photosynthesis, a researcher keeps CO₂ concentration, temperature, and water constant while varying light intensity. Which statement correctly identifies the variables?

    Answer: Light intensity is the independent variable; photosynthesis rate is the dependent variable

    The researcher manipulates light intensity (independent) and measures how photosynthesis rate responds (dependent).

  6. A geologist uses the principle of superposition to date rock strata. In an undisturbed sequence, she finds fossils of complex multicellular organisms in layer D (top), simpler organisms in layer C, primitive single-celled organisms in layer B, and no fossils in layer A (bottom). What does this suggest?

    Answer: The sequence shows increasing complexity of life over time from older to younger layers

    Superposition holds that lower strata are older; the progression from simple to complex organisms from bottom to top is consistent with evolutionary theory.

  7. A researcher publishes a paper claiming a discovery that contradicts a well-established theory. Other scientists attempt to replicate the results and consistently fail. What does this most suggest?

    Answer: The new paper's findings are likely flawed or not replicable

    Replication is a cornerstone of scientific validity; repeated failure to reproduce results strongly suggests the original findings are unreliable.