Croosi boi

123456
Across
  1. 3. a gas that’s bad to inhale
  2. 4. a thing that makes people sick
  3. 5. yourself
  4. 6. a thing (mainly living) dies out
Down
  1. 1. a living breathing thing
  2. 2. a breakthrough that’s new
  3. 3. a slow growing living thing