After what age do the bone eating cells get the upper hand on the bone building cells, making the bones more fragile? * 20 years old
40 years old
50 years old
30 years old
60 years old

Can i get the answer to this problem?

Select all the correct answers. for a claim about the natural world to be considered scientific, what attributes must it have? a). it must be open to modification if new evidence doesn't completely support it. b). it must be based on scientific observations that can be repeated in a controlled setting. c). it must be applicable to future events and occurrences. d). it must be consistent with only a small portion of relevant observations or data.

What organelle makes protein for use outside the cell?