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Photosynthesis
The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.
Atom
The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.
Molecule
A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
Ecosystem
A biological community of interacting organisms and their physical environment.
Carbon Cycle
The series of processes by which carbon compounds are interconverted in the environment.
Force
An interaction that causes a change in the motion of an object.
Newton's First Law
An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Acid
A substance that releases hydrogen ions (H+) in a solution and can donate a proton.
Base
A substance that accepts hydrogen ions in a solution and can donate an electron pair.
DNA (Deoxyribonucleic Acid)
The molecule that carries the genetic instructions for life and is found in the nucleus of cells.