Knowledge and Understanding 1. Scientists must consider the ethical issues of investigations. What are ethical issues?
2. Suggest two advantages of reviewing and reflecting on experiments. 3. Scientists work to gather information to answer scientific questions. Scientists use experiments, modelling and research to collect information. Identify which method you think would be most suitable to investigate the following questions. Justify your answers. (a) Heart rate increases with exercise. (b) Drinking milk reduces the risk of osteoporosis in later life. (c) Burning coal causes smog. (d) Using plant food makes cut flowers stay fresher for longer. (e) Reducing the use of fossil fuels such as coal and oil will slow down global warming.
