Science ECTION: Choose the best answer and write the letter on the space provided. 1. Which of the following statements is true? a) Viruses are living organisms. b) Viruses can cause diseases in hosts by entering the host cells, reproducing them, and damaging host tissue. c) Bacteria are always harmful. d) When large amounts of sewage are dumped into a lake or stream, the organisr in the water may die because bacteria reproduce rapidly and use up the oxyge