A medical imaging technique that uses high-frequency sound waves to create images of the inside of the body.

A type of electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays, commonly used in sterilization and in sun exposure.

Light with wavelengths shorter than visible light, known for its effects on the skin, including sunburn, and its use in sterilization and fluorescence.

A type of inflorescence in which the flower stems all arise from a common point, resembling an umbrella.

The flexible, tubular structure connecting a fetus to the placenta, containing blood vessels that carry oxygen and nutrients.

The navel or belly button, the scar left after the umbilical cord is cut after birth.

A referee or official in sports who oversees the proper conduct of the game.

The layer of vegetation beneath the main canopy in a forest, typically consisting of smaller trees, shrubs, and plants.

A type of appendage found in some eukaryotic cells, typically involved in movement or sensing environmental stimuli.

A type of genetic recombination that occurs when homologous chromosomes align imperfectly, leading to unequal exchange of genetic material.