4. What is the advantage of white blood cells not having a fixed shape? 5. Name two salts found in bile that are responsible for emulsification of lipids. (2 6. State two events that take place during swallowing of a bolus. 7. Outline how oxygen from the atmosphere reaches the muscle cells in the body of an insect.​

c is the correct answer hope this !

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.