One of the key contributions of the punctuated equilibrium model is that it helps explain
A) why transitional fossils are more common than Darwin would have predicted.
B) why transitional fossils tend to be rare and certain common fossil species remain unchanged for long time spans.
C) how new species arise from hybridization events.
D) why large, widespread populations tend to be the ones that evolve most rapidly and unpredictably.
Answer: B
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In the respiratory tract, ciliated cells constantly sweep mucus that contains trapped foreign matter
a. True b. False
Which of the following is an example of evolution that can be observed and studied?
A. Weeds within a farm develop resistance to select herbicides. B. HIV can become resistant to various drug treatments. C. A population of bacteria gain resistance to a specific antibiotic. D. All are examples of evolution that can be observed and studied.
Which of the following is NOT a concept or term related to the flow of energy through living systems?
a. cellular respiration b. consumers c. decomposers d. photosynthesis e. sexual reproduction
Why is it difficult to treat fungal infections in humans?
A. Fungal cells cause chytridiomycosis. B. Fungal cells are dikaryotic. C. Fungal cells have a chitonous cell wall. D. Fungal cells are eukaryotic