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Questions in biology

[Homework Help] A student plans to conduct an experiment to determine how a change in the pH of water affects the population growth rate of algae. To ensure that her experimental data are valid, she should: --- (Note: The original prompt appears incomplete. Based on the context, you might consider adding specific actions or methods the student should take to ensure validity, but I have left it as is per the instructions.)

[Homework Help] The model stating that organic molecules present in ancient seas led to the formation of life's building blocks was the: 1. Bubble model. 2. Primordial soup model. 3. Spontaneous origin model. 4. None of the above.

[Homework Help] A main function of the leaf petiole is: A. to extend the leaf blade away from the stem so the blade can collect sufficient sunlight. B. to keep the leaf away from the secondary meristem of the stem. C. to produce pollen. D. none of the above.

[Homework Help] In a plant that has red flowers, red flower color (R) is completely dominant to white flower color (r). If the plant is heterozygous for flower color, which alleles will be carried by the gametes it produces?

[Homework Help] Which cell cycle checkpoint determines whether the DNA has been replicated correctly? A. The cell growth checkpoint B. The DNA synthesis checkpoint C. The mitosis checkpoint D. The G2 checkpoint

[Homework Help] Which structure releases hormones that signal the tissue lining the uterus to thicken? A. Corpus luteum B. Developing follicle C. Fallopian tube D. Hypothalamus E. Pituitary

[Homework Help] What happens to water that is not removed from land by evaporation?

[Homework Help] List three ways carbon is stored in the biosphere. 1. **In the atmosphere:** as carbon dioxide (CO₂). 2. **In living organisms:** as organic molecules such as carbohydrates, proteins, and fats. 3. **In the oceans:** as dissolved carbon dioxide and carbonate compounds.

[Homework Help] List three significant differences between meiosis I and meiosis II.

[Homework Help] Following the replication of its DNA, each chromosome contains two chromatids, which are attached to each other by a centromere.