Answer: conserving

AnswerCrossword Clue
conservingRetain (a particular amino acid, nucleotide, or sequence of these) unchanged in different protein or DNA molecules
conservingCONSERVE, to preserve (to keep safe from harm)
conservingPreserve (food, typically fruit) with sugar
conservingProtect (something, esp. an environmentally or culturally important place or thing) from harm or destruction
conservingPrevent the wasteful or harmful overuse of (a resource)
conservingMaintain (a quantity such as energy or mass) at a constant overall total