Answer:
B because each of the things described have to do with plants
To determine the reason for the fish death, do the following:
1. Test the water for the presence of organic substances that may be poisonous to the fish.
2. Test the dissolved oxygen concentration of the lake at different locations and at different depths.
3. Perform full toxicological examination of the lake to determine if any pollutant or poisonous chemical is present in the lake.<span />
Your DNA gives instructions for your physical structure
Through studying the process of mitosis, the scientists gained knowledge of cancer. The study led into a wider understanding of cancer because it led to an apprehension on how cancer cells divide and split into two so rapidly.