Which of the following hormones are more important post-puberty for bone growth?

a) insulinlike growth factors
b) thyroid hormones
c) human growth hormone
d) insulin
e) sex hormones

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.