Are the underlined words in the sentence an independent clause, a subordinate clause, or neither?

after the sun sets, turn on the porch light.

a.
neither

b.
subordinate clause

c.
independent clause

Who gave the famous "i have a dream" speech at the march on washington?

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups. b. a researcher conducts a linguistic study of comments posted on a local public blog. c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression. d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.

What percentage of people are left handed?