aperture: Of a camera, the adjustable opening through which light passes to reach the film.
The diameter of the aperture determines the intensity of light admitted. archeology: The study of human history and prehistory through the excavation of sites and the analysis of physical remains, such as graves, tools, pottery, and other artifacts.
The pupil of a human eye is a self-adjusting aperture. archetype: The original form or body plan from which a group of organisms develops.
artifact: An object made by humans that has been preserved and can be studied to learn about a particular time period.
The eggs are soft and vulnerable to drying, therefore reproduction commonly occurs in water.