a lot means large in amount / quantity & a forest contains lots of plants / trees ->  a forest contains a large amount of trees  a forest contains a large amount of trees & a tree contains wood ->  a forest contains a large amount of wood  if something contains something else then that something else is a part of that something & if something is a part of something then that something can be found in that something ->  if something contains something else then that something else can be found in that something  a forest contains a large amount of wood & if something contains something else then that something else can be found in that something ->  large amounts of wood can be found in a forest  large amounts of wood can be found in a forest & wood is a kind of resource -> wood is a kind of resource that can be found in large amounts in a forest