Cooksonia is a genus of very early tracheophyte plants. Unlike modern tracheophytes, they only grew to a few centimeters in height. What feature provides the best explanation for their diminutive size?
A. Cooksonia species were not autotrophic.
B. They consisted of only photosynthetic stems, not roots or leaves.
C. They completely lacked vascular tissues.
D. They did not have stomata.
Answer: B
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The most significant outcome of the Miller and Urey experiment was that they:a
were the first to synthesize living cells. b. demonstrated natural selection. c. proved that the iron-sulfur world hypothesis was false. d. proved that life did not originate on Earth. e. synthesized organic molecules from inorganic materials.
The layer of the gastrointestinal tract wall that is responsible for motility is the
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Using the compound light microscope in the lab room, you observe a wet mount slide preparation. You observe layers of cells that have a definite, rigid, rectangular shape; there appears to be a nucleus in all of the cells and there are many oval-shaped green structures that seem to be moving around inside of the cells in an orderly fashion. What general cell type are you most likely observing?
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