How does extinction reduce biological diversity on earth?

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?

How were royal colonies different from corporate colonies? what was the king's privy council? what role did it play in the house of burgesses? what led to the creation of the rhode island colony? how was the colony governed?