Problem: The Sandwich tern ("Thalasseus sandvicensis") is a tern in the family Laridae. It is very closely related to the lesser crested tern ("T. bengalensis"), Chinese crested tern ("T. bernsteini"), Cabot's tern ("T. acuflavidus"), and elegant tern ("T. elegans") and has been known to interbreed with the lesser crested.

Based on the paragraph above can we conclude that "Sandwich terns have a tendency to befriend other birds belonging to other species."?

A: It's impossible to say

Problem: Blue Nile is an online specialty retailer of fine jewelry. Blue Nile was founded in 1999 and today is the largest online retailer of diamonds. Blue Nile is based in Seattle, Washington and competes with traditional jewelry stores such as Tiffany & Co., and online retailer stores such as James Allen, Belgium Diamonds, Ringsberry.com.

Based on the paragraph above can we conclude that "Blue Nile competed with jewelry stores such as Tiffany & Co. in the years preceding 1999."?

A: Yes

Problem: Carl Andreas Koefoed (known in Russian as , "Andrey Andreyevich Kofod"; 16 October 1855, Skanderborg, Denmark 7 February 1948, Copenhagen) was a Danish agronomist active in the Russian Empire in the early 20th century. He was the brother of Danish chemist Emil Koefoed.

Based on the paragraph above can we conclude that "Danes were sometimes active in the Russian Empire."?

A:
Yes