Children and childhood (no spaces; letters, numbers ok)

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Across
  1. 3. Element relating to geography and migration, incorporated from water sources
  2. 6. Isotopes of this element relate to photosynthetic pathway of the individual's food/food's food
  3. 7. Element relating to geography and migration, whose isotopes are incorporated from dietary sources
  4. 10. Adjective describing the type of growth related to widening bones
  5. 12. Space inside long bones that contains bone marrow (two words)
Down
  1. 1. Dominant mineral in bones and teeth
  2. 2. A cause leading to a condition (e.g. genetic, traumatic injury)
  3. 4. Isotopes of this element reflect the trophic level of an organism
  4. 5. Adjective describing the type of growth related to the lengthening of bone
  5. 8. Type of bone that makes the external surface and also forms in response to injury (two words)
  6. 9. Adjective describing the outer layer of bone
  7. 11. Element using in isotopic comparisons between marine versus terrestrial food sources
  8. 13. The anatomical name for the shaft of a long bone (noun)