Question: You are presented with the question "What acts as an aid to a car engine converting gasoline into motion and heat?" and the following answer choices: - Energy. - oxygen - nitrogen - helium - argon - energy - burning - sugar Now knowing that acar engine usually converts gasoline into motion and heat through combustion and oxygen acts as an aid to combustion, choose the best answer.
Answer: oxygen

Question: You are presented with the question "what usually has clear weather" and the following answer choices: - hurricanes - mild - deserts - less water - autumn - swamps - rain forests - Winter Now knowing that high pressure systems cause clear weather and most deserts occur in regions that typically have high atmospheric pressure, choose the best answer.
Answer: deserts

Question: You are presented with the question "Bottleneck effect can occur with " and the following answer choices: - external migration - direct damage to the lungs - Movement of an air mass - competition - if humans disturb bears - competing for resources - Plant growth is reduced - Temperature changing Now knowing that bottleneck effect occurs when a population suddenly gets much smaller and population growth is reduced by external migration, choose the best answer.
Answer:
external migration