Here's a breakdown of how they achieve this:

* DNA Organization: Chromosomes are essentially organized packages of DNA, which are long, thread-like molecules containing the genetic code.

* Gene Carrying: Genes, the units of heredity, are segments of DNA located on chromosomes. These genes contain instructions for building and maintaining an organism.

* Cell Division: During cell division (mitosis and meiosis), chromosomes ensure that each new cell receives a complete copy of the organism's genetic material.

* Inheritance: Chromosomes are passed down from parents to offspring, carrying the traits and characteristics of the species.

In simpler terms: Imagine chromosomes as libraries filled with blueprints. These blueprints hold the instructions for building and maintaining an organism. When a cell divides, the library is duplicated, ensuring each new cell gets a complete set of blueprints.