How many ppl in this world are gay

In which way does nicotine cause addiction? by stimulating the brain's pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

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 is the lipid molecule that controls what types of molecules can pass though?