[Answer] 3. The wildlife of Iran used to include an animal which is now extinct. Which of these used to roam the northern regions of Iran?

Step 1 : Introduction to the question "3. The wildlife of Iran used to include an animal which is now extinct. Which of these used to roam the northern regions of Iran?"

...1. Lesser bilby 2. Caribbean monk seal 3. Caspian tiger 4. Irish elk The Caspian tiger, also known as the Persian tiger, Turanian tiger, or Hyrcanian tiger, was found in Iran, Caucasus (Armenia), Iraq, Afghanistan, Turkey, Mongolia, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan until it apparently became extinct in the late 1950s. The lesser bilby was an Australian animal, last sighted in 1931. The Caribbean monk seal was last sighted near Nicaragua in 1952, while the Irish elk was last seen in Great Britain around 6,000 BCE.

[Answer] In what year did Iran and several other countries, led by the U.S., reach a controversial nuclear agreement that the U.S. fully exited this week by reinstating sanctions on Iran?

Step 1 : Introduction to the question "In what year did Iran and several other countries, led by the U.S., reach a controversial nuclear agreement that the U.S. fully exited this week by reinstating sanctions on Iran?"

...The Joint Comprehensive Plan of Action, known commonly as the Iran nuclear deal or Iran deal, is an agreement on the nuclear program of Iran reached in Vienna on 14 July 2015 between Iran, the P5+1, and the European Union.