Oxygen because lipids are fats that need oxygen to use long term energy
Food chains I hope this is correct
Definitely i would expect them to concern themselves with your problems when they are so beset with their own. Beset means having a lot of trouble with something, or having to deal with a lot of something causes problems. For example in a sentence; With the amount of traffic nowadays, even a trip across town is beset with dangers.
Answer:
Saudi Arabia, Russia, the United States, and Iran
Explanation:
