Caffeine-producing plants use three different biochemical pathways and two different enzyme families to make the same molecule.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.

The partnering of an alga and a fungus to make lichen may be only two-thirds of the equation.