The metaphyses of a 40-year-old's long bones have

structure is maintained and sustained by:

-cytoskeleton: gives cells coherence

-cell wall: support

-cytoplasm: shape

hope this .

i think that d. wind is the answer.   i missed the question when i answered a. currents.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

meiosis is the correct answer