In 1950,the Age Structure Pyramid in More Developed Countries Looked

question 2

Multiple Choice

In 1950,the age structure pyramid in more developed countries looked similar to the letter ________ and in 2030,it is expected to look more like the letter

• A)A; U.
• B)A; T.
• C)I; T.
• D)I: U.

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Definitions:

Crystalline Polymers

Polymers characterized by a highly ordered molecular structure with regions of well-aligned molecular chains, giving them unique physical properties.

Long-Chain Polymers

Macromolecules consisting of a large number of monomer units connected by covalent bonds, typically featuring high molecular weights.

Monomer Units

Individual, small molecules that can bind chemically to other monomers to form polymers through repeated sequences.

Repeating Segment

A consistent sequence of atoms or groups within a polymer that repeats along its chain.