Which cells of bones secrete the matrix of hanoverian canal?

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint