Weak Points

Question 1

photoautotrophic,
symbionts, or pathogens

Answer 1

alpha proteobacteria

Question 2

nitrogen cycle

Answer 2

beta proteobacteria

Question 3

human gut
symbionts and pathogens

Answer 3

gamma proteobacteria

Question 4

generate sporeforming fruiting bodies or reduce sulfur

Answer 4

delta proteobacteria

Question 5

in animal digestive
tracts and hydrothermal vents

Answer 5

epsilon proteobacteria