During childhood and teens years which bone cell would be most active

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

The affordable care act has expanded mental health and substance abuse benefits to 62 million people and is an addition to the mental health parity act of 2008. the changes and additions require mental health coverage in small group and individual plans where people were not previously covered. what is the biggest benefit of these changes? what major challenges are still associated with mental health coverage? explain your reasoning.

Which one of the following causes people to go through a cycle of losing weight, gaining it back, then lose it again