Flashing red lights at a railroad crossing mean
a. stop
b. proceed, if it's safe
c. yield to the train
d. if no train is in sight, keep going

Early in life thomas was diagnosed with intellectual disability. he lives with his parents, spending his days at a local adult day-care facility. through tutoring he has reached an elementary school level of education and is able to do simple tasks to out around the house.

Why is the netherlands vulnerable to changes in climate? a. the netherlands is against nuclear power. b. forests in the netherlands have been destroyed by acid rain. c. the netherlands wrote the kyoto protocols. d. the netherlands is low-lying country, and rising sea levels may cause flooding.

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?