What are polymers? Through which process are they synthesized or made?

Polymers are large molecules with a chain structure that can be linear, branched, and cross-linked. Polymer chains are mainly composed of covalently bonded atoms.

Explanation:

Polymers can be synthesized using  reactants of petrochemical or renewable origin. Polymers can be synthesized in two  methods, by step-growth and chain polymerization. Both ways of polymerization are  random processes during which chains of different lengths are formed.

The basis of step-growth polymerization is the condensation reaction.

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.