Which layer of the digestive tract covers and protects the gut?
A. lumen
B. mucosa
C. submucosa
D. longitudinal muscles
E. serosa
E
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The structures that will exchange nutrients and
wastes with maternal blood are indicated by a. A. b. B. c. C. d. D. e. E.
The adhesion molecules in plants are most similar to those of:
A. animals. B. choanoflagellates. C. green algae. D. cyanobacteria.
Courtship for Anolis lizards involves the male displaying a dewlap (skin under the throat area) that varies in appearance based upon the species. Lizards that are found in darker, more shaded environments will have dewlaps that are lighter in color because they are more noticeable by potential mates. Which of the following mechanisms best explains how speciation is at work in this example?
A. Postzygotic isolation B. Reinforcement C. Genetic drift D. Natural selection Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about speciation? What other information is related to the question? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What is a criticism of the hydrothermal vent origin of life theory?
a. Hydrothermal vents are too hot and would have destroyed the organic molecules even as they formed. b. Hydrothermal vents are too salty and would have destroyed the organic molecules even as they formed. c. Hydrothermal vents are unstable in general and would have dissipated the organic molecules. d. Hydrothermal vents lack sufficient oxygen for the evolution of aerobic organisms. e. Hydrothermal vents contain too many dissolved mineral ions.