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The process of change by which an organism or Species becomes better suited to its environment.

A minute portion of matter.

The relative amount of a particular substance contained within a solution or mixture or in a particular Volume of space.

The extent, width, or Area covered by something.

A substance that flows freely but is of constant Volume, having a consistency like that of water or oil.

The change of place, position, or state of something.

The ability or tendency of something to float in water or other fluid.

The quantity of matter which a body contains, as measured by its acceleration under a given force or by the force exerted on it by a gravitational field.

Isaac Newton was well known for his work on Gravity and the three laws of motion.   A Newton unit refers to how much force is required to make a Mass of one kilogram accelerate at a rate of one metre per second squared.

The amount of space that a substance or object occupies, or that is enclosed within a container.