<span>DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.</span>
Answer:
the fine transparent tubular sheath which envelops the fibres of skeletal muscles.
Bacteria and fungi carry out decompostion of plants and animals