After reading https://www.jstor.org/stable/3562566?

After reading https://www.jstor.org/stable/3562566?seq=1#page_scan_tab_contents , answer these question:

1. Explain why Callahan rejects the conjunction of respect for autonomy and patient well-being as a successful justification of voluntary active euthanasia.
2. Explain why Callahan rejects the attempt to justify voluntary active euthanasia on the grounds that there is no morally relevant distinction between killing and letting die. 
3. Present Callahan's treatment of the supposed paucity of evidence to show likely harmful consequences of permitted voluntary active euthanasia.
4. Present Callahan's treatment of the claim that euthanasia is compatible with medical practice.