When the first antibiotics became available in the late 194Os and early 1950s, these antibiotics were effective against all bacterial infections.
Today however, there are a multitude of antibiotic resistant bacterial
infections. What conclusion can be drawn?

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.