A keystone species is a species whose presence a Is an indicator of poor environmental health b Is the main reason a community exists c Provides food for all other species in a community d Influences the population size of many other species in its community e Is always at the top of the trophic levels as a top predator

Explain the cellular functions that occur when antibiotics attack a bacteria cell. a. antibiotics target the cell wall, cell membrane, and the processes of protein and nucleic acids production in bacteria to rupture the cell. b. antibiotics create dormant resistant endospores to preserve the genetic material and rupture the cell. c. antibiotics target the cell wall and form a bridge-like connection to form conjugation. d. antibiotics use binary fission to grow twice its size, replications its dna, and split into two cells.