A mass extinction, perhaps caused by a large asteroid hitting Earth near the Yucatan peninsula in the Cretaceous period, produced_____________, which created uninhabitable conditions.
A. active tectonic plate movements that rapidly repositioned continental plates
B. All of the answer choices are correct.
C. massive volumes of soot, and triggered major climate changes
D. forest and range fires over hundreds of years
E. a large numbers of volcanic eruptions for millions of years
C. massive volumes of soot, and triggered major climate changes
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In a plant, the exchange of gases with the environment involves
a. leaves. b. roots. c. stems. d. all of these
What are leaf veins?
A. Vascular bundles in leaves B. Photosynthetic cells in leaves C. Sclerenchyma cells in leaves D. Palisade mesophyll in leaves E. Spongy mesophyll in leaves
In your Drosophila laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ___________ gene.
A. pair-rule B. gap C. maternal effect D. segment-polarity E. gap or segment-polarity
Process by which cells engulf large substances, forming an intracellular vacuole.
What will be an ideal response?