A plough (UK) or plow (US; both /ËplaÊ/) is a tool or farm implement used in farming for initial cultivation of soil in preparation for sowing seed or planting to loosen or turn the soil. Ploughs were traditionally drawn by working animals such as horses or cattle, but in modern times are drawn by tractors.
Polar/Nonpolar Regions. In a biological membrane, the phospholipids are organized into a bilayer, which serves as the framework in which the other components of the membrane are embedded.
In the lipid bilayer, the polar âheadsâ of the phospholipids are arranged so as to interact with the aqueous environments on the inside and the outside of a cell, while the nonpolar âtailsâ coagulate together to form a nonpolar bilayer.n the lipid bilayer, the polar âheadsâ of the phospholipids are arranged so as to interact with the aqueous environments on the inside and the outside of a cell, while the nonpolar âtailsâ coagulate together to form a nonpolar bilayer.