To whom is an essay on man addressed

What is the italicized part in the sentence , all of the operators are efficient.

What kind of words would be to find the information from a database about changes in height of an ocean surface over a 20 year period

"dyed plant fibers have been found at dzudzuana cave in georgia, dating back to 30,000 years ago." a good paraphrase of this sentence should include: a. how the dyed plant fibers were located within the different caves. b. how old the dyed plant fibers are at dzudzuana cave in georgia. c. the types of plant fibers found in dzudzuana cave in georgia. d. the types of dyes made from plant fibers thousands of years ago.