Most plants continue to grow throughout their lives, and lilies continually produce new bulbs, from which grow new plants. Given these facts, what continues to grow throughout their lives?  among the following options:
- potatoes
 - Hemoglobin
 - tortoises
 - plastic  roses.
 - Human teeth.
 - Lilies.
 - Silk daisies.
 - vegetation


 

      Lilies.   