Problem: Does "This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are visible." answer the question "What type of satellites does the American GPS system use?"

A: no

Problem: Does "Studies have shown a variety of effects including timing changes in migration, breeding as well as population variations." answer the question "What is expected to have an effect on migration timing?"

A: no

Problem: Does "In the Hellenistic age scholars frequently employed the principles developed in earlier Greek thought: the application of mathematics and deliberate empirical research, in their scientific investigations." answer the question "Greek thought is predominately applying mathematics and what other method?"

A:
yes