How did Darwin suggest that one ancestral group of finches evolved to produce several related species of finches over time?
What will be an ideal response?
Darwin hypothesized that the unique conditions of each island selected for adaptations in finch populations.
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Oxygen levels in the photic zone fluctuate over the course of a 24-hr period. If you were measuring dissolved oxygen over the course of the day, when would you expect to see the lowest levels of oxygen and why?
A. Mid-morning -- because fish are most active and their respiration rates are highest. B. Early afternoon -- when the surface water warms up and sinks to the bottom. C. Mid-afternoon -- because the activity of the Calvin cycle (the dark reactions) of photosynthesis are at their peak. D. Early evening -- when animals come to feed and disturb the surface waters. E. During the night -- because the light reactions of photosynthesis are inactive. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about oxygen levels? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? 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?
Which statement about mutations is not true? (Choose all that apply)
A. Mutations make evolution possible. B. Mutations result in genetic variation among individuals. C. Mutations accumulate in a genome over time. D. Mutations are usually caused by exposure to radiation. E. Mutations can be harmful, beneficial or neutral. F. Mutations occur as a direct response to an organism's attempt to change one of its traits.
Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. Light, water, minerals, and dissolved gases surround the whole body of a submerged green alga, and buoyancy of water provides physical support. What part did plants evolve to absorb gases without drying out on dry land?
A. pollen B. stomata C. vascular tissues D. cuticle E. lignin
You are carrying out experiments in cell fusion by fusing together cells at different stages of the cell cycle. You then observe the behavior of each nucleus residing in the combined cytoplasm of the two cells. Which of the following results reflects what would occur if you fused a G2 cell to a cell in the M phase?
a) the G2 chromosomes would undergo premature chromosome compaction b) the G2 chromosomes would be elongated and would consist of only one chromatid each c) the G2 chromosomes would decondense d) the nucleus from the G2 cell would start to replicate its DNA