Answer:
Row 2
Explanation:
It is a food chain, not a food web. It is more complex than the food web.
The short answer is: The scientist means that a dose of 20 mg per kilogram is enough to kill one half or fity percent of the animals used in the test. LD stands for leathal doseage. The 50 means 50 percent. Subsequently a dose of 20 mg per killogram has a lethal dose that will kill 50% of the test subjects.
The Sympathetic division and the Parasympathetic division
I think it's B, higher in the medium than in the cell's cytoplasm
