All of the following factors can cause famines except A
the failure of food production to keep pace with population growth
B
distribution problems caused by political turmoil
С
new, higher-yield crops
D
crop failure brought on by sustained drought

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i