Pulmonary vein
Aorta
Pulmonary artery
Vena cava
The scientific method steps are
1. Observe
2. Question
3. Hypothesis
4. Production based on the hypothesis
5. Test
6. Use results to conclude if your hypo was right or not.
7. Make a new hypo
The method is a scientific way of finding the answer to your questions. Or in other words. Gathering knowledge that is based on characterized and developed scientific evidence.
Answer:
A. A Densley populated country.
Explanation:
Not really some take faster time
