question:
According to these theories, the concept of time depends on the spatial reference frame of the observer, and the human perception as well as the measurement by instruments such as clocks are different for observers in relative motion.
According to Einsteins two relativity theories, the concept of time depends on what?

answer: yes

question:
After 1870, the new railroads across the Plains brought hunters who killed off almost all the bison for their hides.
what animal did hunters kill off for their hides?

answer: yes

question:
Some species, such as walnut and cherry, are on the border between the two classes, forming an intermediate group.[citation needed]
What kind of woods have pores that are uniformly sized?

answer: no

question:
Such a phenomenon can also take place within Great Lakes communities such as Ashtabula, Ohio, which received programming from the CBC's London, Ontario, transmitter, based upon prevailing atmospheric conditions over Lake Erie.
Which US city can receive broadcasts from CBC's London transmitter?

answer:
yes