When nonvirulent bacteria were mixed with dead virulent bacteria, griffith unexpectedly found that the injected mice died. He explained this behavior by suggesting the nonvirulent strain of bacteria as being.

Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.

Which of the following sentences uses an incorrect verb? a. there is only one good candidate. b. many good candidates are possible. c. a good candidate is hard to find. d. there is many possible candidates.