2. binary fission
3. antibiotics
4. host
5. nitrogen-fixing
6. Producers
7. d
8. a
9. b
10. b
11. c
12. d
13. c
14. d
15. Both forms of bacteria help plants grow. Nitrogen-fixing bacteria supply plants with nitrogen, and decomposers supply plants with nutrients.
16. In the lytic cycle, the virus immediately reproduces after infecting the host. In the lysogenic cycle, the virus inserts its genes into the host cell. The host cell divides several times before viruses begin their lytic cycle.
17.
18. Most bacteria would face no problems at all. The only bacteria that might have a problem are pathogenic bacteria that only infect humans.
19. Perhaps archaebacteria would colonize first because they can live in hostile environments.
20. about 70 billion bacteria
21. about 20 weeks
22. stage 3
23. stage 2
24. stage 1
25. stage 2
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