Africa is the second-largest continent on Earth, covering about 30.

Asia is the largest and most populous continent in the world, covering about 30% of the Earth's land area.

The circulatory system, also known as the cardiovascular system, is a complex network of blood vessels, the heart, and blood that helps transport oxygen, nutrients, hormones, and waste products throughout the body.

Cystic fibrosis (CF) is a genetic disorder that primarily affects the lungs and digestive system.

DNA, also known as deoxyribonucleic acid, is a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.

DNA sequencing is a process used to determine the precise order of nucleotides in a DNA molecule.

Down syndrome is a genetic disorder characterized by a distinct physical appearance, intellectual disability, and developmental delays.