- Comparing blood and hormones of different organisms is a technique referred to

as:

RadioImmunoassay

Explanation:

RadioImmunoassay is a technique used in the measurement and comparison of hormones. It helps to identify difference in the hormone concentration of various species. It makes use of Anti-bodies directed against the hormones and the radio-labelled forms of hormones. A standard curve that contains a known amount of hormone is then use to compare and calculate measurements of the new hormones.

answer; the code in musculoskeletal system subsection is associated with deep tissue possibly to the bone;