Answer:
Organic matter
Explanation:
As organic matter continue to build up in a pond, vegetation will begin to appear in the pond. The first set of vegetation to appear are the floating vegetation. Subsequently, submersed plants begin to grow also.
With time, organic sediments continue to fill the pond and its depth is gradually decreased. A swamp or bog is now formed.
This trend of succession continues until the pond eventually turns into land.
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The best explanation is the new "experimental evidence", which occur with the help of new and improved technology. For this question, I suggest you to answer letter b).
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Looks like you simply substitute the length of the femur
