<span>They have setae covering their bodies.
They have a one-way digestive system.</span>
Limestone.
It is a sedimentary rock composed of calcite and aragonite. It is used as a building material mainly because it is easily available and easy to work with.
Limestone is used in the manufacture of steel as it is the primary raw material that helps to remove impurities from the iron ore and produces waste matter that has low melting point and viscosity
Answer:
protiens: amino acids
lipids: fatty acid and glycerol
carbohydrates: monosaccharides
nucleic acid: nucleotides
Explanation: