A transparent structure in the eye that focuses light onto the retina.

Relating to still freshwater habitats, such as lakes and ponds.

A porous structure in the bark of stems and roots that allows gas exchange.

Shaped like a lens or lentil.

A hybrid cross between a male leopard and a female lion.

An order of insects that includes butterflies and moths, characterized by scaled wings.

The study of leprosy (Hansen’s disease) and its treatment.

A chronic infectious disease caused by Mycobacterium leprae, affecting the skin and nerves.

A craton that forms the ancient core of North America, which was part of the supercontinent Rodinia.

A fundamental principle of physics stating that energy cannot be created or destroyed, only transformed.