i can hardly see it sry...
The answer is c.diffusion.
Diffusion is the movement of ions, molecules or atoms form high concentration to low concentration across the membrane without the need of any energy or any membrane gates. The oxygen enters the alveoli will be dissolved in the water vapor that is present on the wall of the alveoli and will diffuse directly to the blood across the alveolar membrane.
Answer:
Beta decay is most common in elements with a high neutron to proton ratio. Gamma decay follows the form: In gamma emission, neither the atomic number or the mass number is changed. A high energy gamma ray is given off when the parent isotope falls into a lower energy state.
Explanation:
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Reflection, refracting, and the energy levels of molecular orbitals
