A situation where two or more genetic variants are maintained in a population because they confer a selective advantage.

A structure found in the nuclei of certain cells that is associated with the transcription of rRNA.

A group of whales that have baleen plates used to filter food from water, such as the blue whale and…

A type of joint that allows for rotational movement in several directions, such as the shoulder or hip joint.

An ancient geological landmass that was part of the supercontinent Pangaea and later contributed to the formation of Europe.

A unit of pressure used to measure atmospheric pressure.

A sharp projection on a structure, such as the barbs on the feathers of birds or the spines of fish.

A class of drugs that act as central nervous system depressants, used for their sedative and anticonvulsant properties.

Small, hair-like structures that branch off the barbs of feathers, playing a role in maintaining the feather structure.

A chemical element with symbol Ba and atomic number 56, used in various industrial and medical applications.