Variation in the number of repeated structures in an organism, such as segments or fins, often used to study genetic diversity.

The process of forming or developing meristematic tissues in plants or regenerating lost parts of a plant.

The temperature at which a solid becomes a liquid, usually under standard atmospheric pressure.

A plot that shows the changes in temperature or energy during the melting process of a substance.

A thin layer of material that separates and protects the interior of cells or organelles from their environment.

The electrical potential difference across the membrane of a cell, crucial for processes like nerve signal transmission.

The ability of a cell membrane to allow certain substances to pass through while blocking others.

A network of membranes within a cell that divides the cell into compartments and plays a role in intracellular transport.

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

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