A(n) is a rule that describes a pattern in the natural world. A) theory B) hypothesis C) observation D) scientific law

the answer is D) scientific law

D) A Scientific Law

Explanation:

Observations, Hypotheses, and Theories are preliminary "laws", so they are not substantial enough to be considered a "rule". The key word in this question is "rule", which has to be super-substantial. Therefore it is D.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.