Which of the following scenarios describe an ecological succession?
A. The site of a volcano eruption that is going back to its pre-eruption state
B. The regrowth of a forest after a fire
C. An old field left abandoned that transforms back into a forest over time
D. All of the above are examples of ecological succession
Answer: D
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If a meteor impact or volcanic eruption injected a lot of dust into the atmosphere and reduced the sunlight reaching Earth's surface by 70 percent for one year, which of the following marine communities most likely would be least affected?
A) deep-sea vent B) coral reef C) intertidal D) pelagic E) estuary
A defect in the HoxA-3 would most likely result in:
A. defects of the thyroid. B. defects of the limbs. C. an enlarged heart. D. defects of the lungs. E. abnormal positioning of the kidneys.
In which of these stages does the chromosome consist of two chromatids?
1.prophase and anaphase 2.metaphase, prophase, and anaphase 3.metaphase and prophase 4.metaphase, telophase, and prophase 5.at any time during cell division
Natural selection is a process by which:
a. the characteristics of individuals change over time. b. the characteristics of populations change over time. c. Both of the above. d. None of the above.