Generally, you can calculate it with this formula: df = (r-1)(c-1) where r is the number of rows and c is the number of columns.
Explanation:
femur
The femur is one of the most researched bones in the human anatomy and forensic medicine. As the longest bone in the human body, it is well preserved in skeletal remains.
<span>hromoplast is the generic term but is usually used to refer only to those plastids that do not have chlorophyll.</span>
I believe the answer is D) reactivity. Hope this helps. (ノ◕ヮ◕)ノ*:・゚✧