Answer:
The purpose of colorful petals is to attract insects
DNA contains sugar deoxyribose, while RNA contains sugar ribose,
DNA is a double-stranded molecule, while RNA is a single-stranded molecule.
Answer:
The alveolar walls and capillary walls share a membrane. That's how close they're getting. This allows oxygen and carbon dioxide to readily pass from the respiratory system to the circulation. Oxygen molecules bind to red blood cells as they return to the heart.
