Illusion

A false impression or belief; misleading idea

Genes

Tiny units of a cell of an animal or plant that determine the characteristics an offspring inherits from its parents

Target

A mark or object that is aimed at

Increase

To make or become larger in size or number

Developed

Brought or came gradually into being

Generations

Steps in the line of descent from an ancestor

Ferocious

Savage or fierce

Appear

To come into sight; to be seen

Transparent

Allowing light to pass through so that things on the other side can be clearly seen

Ripple

A very small wave

Coral

A hard substance like stone, found in tropical seas

Unless

Except on the condition that