The evolution of aquatic vertebrates that could live on land likely involved an intermediate species that
A) could fly.
B) had a single lung.
C) had a tracheal system of branching internal tubes.
D) had both gills and lungs.
Answer: D
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Which of the following is NOT one of the five
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Which of the following is a bacterium associated
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After forest harvest in an old-growth forest of the Oregon Cascades, an ecologist noted that the species that were present after 5 years differed from the species that were present 25 years later, and these differed from the species that were present
75 years later. What are the general characteristics of the species at each stage, and why does the community change over time?