Words of six letters, anagrams three. Tell me then, what can they be?

The first:
A person that will marry you;
Waiting to hear the words "I do".

The second:
A ghost, a spirit, or fairy;
If it's evil, you'd best be wary.

The third:
What you see when you see a skunk;
Lucky you've not an elephant's trunk.

What are the words?

Make CARP (fish) evolve into GOAT (mammal) by changing one letter at a time. Each change must produce a valid word in the English language. But there is a catch. The evolution must go through NEWT (amphibian) and CROW (bird). No word can be used more than once.

CARP ---- NEWT ---- CROW ---- GOAT

There is a 7-letter word that has, as one of its definitions, a 6-letter word. Now, switch the positions of the third and sixth letters of the original word, making a new word (an anagram). One of its definitions is now that same 6-letter word, except that it is split into two words (for example, "inward" can be split into "in ward").

What are the two words? What are the definitions?

Which president from Group B can be added to Group A? Why?

Group A: William Harrison, Zachary Taylor, James Garfield, John Kennedy

Group B: Thomas Jefferson, Abraham Lincoln, Ulysses Grant, Warren Harding, Franklin Roosevelt, Jimmy Carter

What does this rebus represent?

The late Dan DeLion: "It's nice that someone mows the cemetery grass"
The recently deceased Mary O'Nette: "It's enjoyable just lying around"
The dearly departed Otto MacAnic: "I'm happy not having to share a room"
The just interred Anna Robic: "I appreciated the beautiful eulogy"

Each statement describes two words that when fused together create a new unrelated word (not a compound word). The clues do not necessarily indicate in which order the two words are attached. Example: This is the oldness of a tablet (pill + age = pillage).

1) This is a sleep relative.
2) This is a masculine painting.
3) This is when a snake stops moving.
4) This is body waste from a fruit.