Science part 2 Teas 2021. A scientist has noted a possible relationship between a certain chemical substance found in fish and the occurrence of kidney failure in human. Which of the following preliminary steps should the scientist take before conducting a controlled experiment.2. Which of the following hormones regulates calcium levels in the blood.3. which of the following is a response to the release of antidiuretic hormone.5 Which of the following describes how RNA and DNA are used in Mitosis?6. In which of the following organ does meiosis occur?7. If damage occurs to the alveoli of the lungs which of the following is true.