Tiny, often microscopic, animals that live in the interstitial spaces of sediment or in aquatic environments.

A type of cell division that reduces the chromosome number by half, resulting in the formation of gametes (sperm and eggs).

The first division in meiosis, where homologous chromosomes are separated into two daughter cells.

The second division in meiosis, where sister chromatids are separated into different daughter cells.

A spore formed by meiosis, typically in fungi or plants, involved in reproduction.

A pigment found in the skin, hair, and eyes that provides color and protects against UV radiation.

A type of skin cancer that originates in melanocytes, the cells that produce melanin.

Organelles in melanocytes that contain melanin and are responsible for its production and distribution.

The physical breakdown of food into smaller particles, typically involving chewing and churning in the stomach.

The middle value in a set of data when arranged in numerical order.