11. Once stained with hematoxylin and viewed through a microscope, growth rings are apparent. 12. Lee studied the growth of fish using the growth rings on their scales. 13. Park Superintendent Mike Gordon said cross sections displaying the growth rings would be made. 14. The most commonly used techniques involve counting natural growth rings on the opercular series. 15. Environment affects the size of the first growth ring . 16. Old wood will show its age by the number of growth rings in an inch. 17. It was widely known that large dinosaur bones displayed growth rings , much like tree rings. 18. Other indicators of past climate include the presence of tropical species, coral growths rings , etc. 19. Where there is little seasonal difference growth rings are likely to be indistinct or absent. 20. Cores on very old trees give information about their growth rings without destroying the tree.
