Which of the following is a characteristic of all living things? A

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Which of the following is a characteristic of all living things? A. obtain energy from an outside food source 3. maintain homeostasis C. sexual reproduction D. multicellular Single-celled organisms, such as paramecia, are able to sense a food source and move toward it. Which key characteristic of all living organisms does this example illustrate? A. regulation and homeostasis B. sensitivity and responsiveness to the external environment C. adaptation to environment D. ability to grow and reproduce Viruses contain genetic material, and they can evolve over time and adapt to their environment. However, they also must use the machinery of the host cells they invade to reproduce and do not carry out any metabolic processes on their own. Based on this description, should viruses be classified as "living? A. Yes. Viruses contain genetic material, just like other living things. B. Yes. Viruses have the ability to adapt and change. C. Yes. Reproduction is one of the characteristics of living organisms. D. No. Viruses cannot reproduce or conduct metabolic functions on their own. Scientific study always begins with: A. hypotheses. B. data. C. observations. D. experiments. The proposed explanation for a phenomenon is best described as A. an experiment. B. an observation. C. a testable prediction. D. a hypothesis. If your hypothesis is, "Echinacea reduces the duration and severity of the symptoms of the common cold," what is your null hypothesis ? A. Echinacea increases the duration and severity of the symptoms of the common cold. B. Echinacea reduces the duration and severity of the symptoms of the flu. C. Vitamin C reduces the duration and severity of the symptoms of the common cold. D. Echinacea has no effect on the duration and severity of the symptoms of the common cold.