Phospholipids line up so that their heads point outward, toward water, while their tails point inward. What is this double layer of phospholipids called?

the lipid single layer

the nucleic bilayer

the lipid bilayer

the lipid tri-layer

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{y}{r .     {r}{y}

explanation:

compost can be added to topsoil as a:

pesticide

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.