The director-general fo the World Health Organization has more than once warned that another influenza ____ based on avian influenza or Asian bird flu is fast approaching. (A)toxin (B)rivalry (C)pandemic (D)symbiosis
33. Many fungi produce antibiotics, for example, penicillin, that stop bacterial growth. Which is the evolutionary advantage to
the fungus of secreting antibacterial chemicals?
(A)defense: preventing bacteria from infecting the fungus
(B)defense: preventing bacteria from killing fungal spores
(C)predation: consuming the bacteria
(D) symbiosis: attracting helpful bacteria
(E)competition: destroying bacteria that compete for their food