The two cells of the similar shape, and size have different levels of the ongoing metabolic activity. On one hand, the cell a is metabolically quiet, which means that no energy consuming chemical reactions are taking place in this cell. On the other hand, the cell b is actively consuming the surrounding oxygen. In this scenario, the oxygen will more quickly diffuse into the cell b because the diffusion gradient for oxygen in this cell is steeper than in the cell a.
Hence, the blanks can be filled with 'b and the diffusion gradient is steeper' respectively.
The sun's endothermic or exothermic energy has a different, but distinct actions with Earth, which makes them suitable for each other. With the sun's endothermic energy, Photosynthesis occurs in plants, it helps plants absorb heat energy from the sunlight, which lets the plants convert carbon into oxygen and glucose. While the exothermic energy, causes rain. It lets the condensation process of water vapor release energy in the form of heat, which causes rainfall.
There are few donor lungs available.<span>In 2010, about 1,800 lung transplants were performed in the United States.
Brainliest please?</span>
