With the invention of the stethoscope, physicians were able to listen to the various sounds made by the heart and lungs. And began to be able to identify if patients had any diseases or ailments.
Answer:
The correct answer is A. People breeding dogs to be less aggressive.
Explanation:
Natural selection, according to Darwin, is the process by which species adapt to the environment, given certain pressures it might set upon them. The other choices refer specifically to a natural adaptation, such as bacterias becoming more resistant, birds' beaks changing and moths changing to darker colors. However, a person breeding a dog to be less aggressive is not an example of natural selection, given the fact that specific breeding is an artificial method, not relying on the natural changes to adapt to the environment.
Answer:
The region between the Appalachians and the Mississippi River became more densely populated between 1790 and 1860. b. Central California was very densely populated in 1861.
Explanation:
Answer:
Money and education allow many people to venture farther, without needing to rely on relatives
Explanation:
