Glossary
Unit 9
  at one's disposal available to use
  creature animal
  defend protect
  ecosystem local environment (including the food chain and natural features)
  emit release; produce
  enemy opponent
  fierce powerful; aggressive
  layout arrangement; organization
  mineral naturally occurring, inorganic material (almost always solid)
  organ vital body part (ex: heart, lung, kidney)
  perception opinion; point of view
  spectacular amazing
  touch down land; set down
  vast very wide and spacious
  vessel boat