The correct answer is a. cilia
Gas exchange happens in the D. Alveoli
The troposphere is hotter near the Earth's surface because heat from the Earth warms this air. As the altitude increases the number of air molecules decreases, the average of their kinetic energy decreases.
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No they form a double layer
Explanation: Because the heads are polar molecules they (form hydrogen) bonds with water molecules found outside the cell and in the cytoplasm and they arrange on the outer layers (the outside of each side) of the cell membrane. In contrast the tails are nonpolar and (cannot form hydrogen bonds) are found in between the polar heads in the middle of the cell membrane. The tails bond to each other.
(Phospholipids form a double layer because heads, water loving, are attracted to the water in the cytoplasm inside the cell and the watery fluids outside the cell. The tails are water repelling and they are between the or in the middle of the heads.)
George Mendel chose to use purebred plants in his experiments because they have a variety of traits.
