Does the sentence "Radio waves are electromagnetic waves which carry signals through the air (or through space) at the speed of light with almost no transmission loss." provide a valid answer to the question "What is essential for the mating of the elements that create radio waves?"

A: no

Does the sentence "Santa Monica fleet vehicles and Buses now source their natural gas from Redeem, a Southern California-based supplier of renewable and sustainable natural gas obtained from non-fracked methane biogas generated from organic landfill waste." provide a valid answer to the question "What company provides the city with natural gas?"

A: yes

Does the sentence "European colonialism in the Sahara began in the 19th century." provide a valid answer to the question "During what time were good moved through more modern means?"

A: no

Does the sentence "In the late 19th century, the most influential theorists were William James (18421910) and Carl Lange (18341900)." provide a valid answer to the question "In what year did Lange die?"

A:
yes