We have a responsibility to protect the biodiversity of the Earth.

This metal has very high malleability.

This new software has backward compatibility, so you can use old version data without any problems.

This new software maintains upward compatibility with the old version.

These two software have complete interchangeability.

Cats are digitigrade animals, they walk on their toes.

He learned about unguligradism in his zoology class.

His research mainly focuses on the plantigradism of mammals.

She has polycystic ovary syndrome.

He is writing a thesis on monotheism.