AQA GCSE Combined Science Trilogy key terms

Tiny hair-like structures on the surfaces of some cells that beat to move substances, such as mucus.

A representation of an electrical circuit using standard component symbols and lines for connecting wires.

The organisation of living organisms into groups using shared characteristics.

A long-term change in weather patterns and conditions, such as temperature and rainfall.

A simplified representation of the Earth's climate system, used to investigate how it works and predict how it may change.

A study in which a potential medicine is tested on human volunteers or patients to investigate safety, efficacy or dose.

An organism that is genetically identical to its parent and to other offspring produced by the same asexual process.

An unbroken conducting path around which electrical charge can flow.

A system with no resultant external force acting on it, so its total momentum remains constant.

A sedimentary rock made mostly of carbon, formed from buried remains of ancient plants.

A number placed before a chemical formula in an equation that multiplies the whole formula.

The number of collisions occurring each second.

An explanation of reaction rates based on how frequently reacting particles collide and whether their collisions have sufficient energy to cause a reaction.

A reaction in which a substance burns in oxygen, releasing energy.

An ancestral organism or population from which two or more groups evolved.

A disease caused by a pathogen that can spread between organisms.

All the populations of different species living and interacting in an area.

The struggle between organisms for resources that are in limited supply.

Burning with a sufficient oxygen supply; the carbon and hydrogen in a hydrocarbon form carbon dioxide and water.

An individual substance included in a mixture. In a formulation, each component has a particular purpose.

One of two perpendicular forces that together have the same effect as a single original force.

A material made by combining two or more different materials to obtain useful properties.

A substance containing two or more different elements chemically combined in fixed proportions.

A measure combining two quantities, such as distance divided by time, expressed in units such as mm/min.

A region of a longitudinal wave where the particles of the medium are closer together than usual.

A solution containing a relatively large amount of dissolved substance per unit volume.

The amount of a substance in a given volume of a mixture or solution.