The definitions (Unit 6)

................ is "to keep something as it is"

• preserve

• 
  recycle

• 
  inform

• 
  natural

............. is "from nature"

• knowledge

• 
  protect

• reduce

• natural

.............. is "to make something less or smaller"

• protect

• 
  natural

• 
  reduce

• 
  responsible

................. is "to have the duty of taking care of or looking after something or someone"

• 
  inform

• 
  responsible

• 
  preserve

• 
  

  knowledge

.................. is "information learned from studying"

• 
  reduce

• 
  

  responsible

• 
  knowledge

• 
  natural

................... is "to tell someone about something"

• 
  inform

• 
  

  recycle

• 
  preserve

• 
  

  protect

..................... is "to keep someone or something safe"

• 
  knowledge

• 
  inform

• 
  responsible

• 
  protect

...................... is "to collect used thing in order to reuse them"

• 
  natural

• recycle

• 
  reduce

• 
  protect

................ is "the act or talking with others about ideas"

• 
  survive

• 
  

  flood

• 
  forever

• 
  discussion

...................... is "for all time"

• 
  permanent

• 
  destroy

• 
  forever

• 
  future