do Jehoavah's Witnesses believe in the evolutionary theory? What is their stance on it?

They do NOT believe in evolution and have actually written a book on creation vs evolution.

However, this "religion" is a cult so do extensive research before you get involved.

No, we don't believe in evolution.

All life forms are from direct creation by Jehovah God.

We do recognize that individual species can be modified by their environment, but they don't change into another form, ie lizards don't become cats (a real stretch, but a hyperbole sometimes get the point across).

Undoubtably some believe in it. Undoubtably others do not believe in it. I am not a Jehoavah's Witness, so I cannot give you such a stance. You would likely find many different stances among Jehoavah's Witnesses who believe in evolution.

Here's our belief:

*** Bible Citations ***

(Revelation 4:11) “You are worthy, Jehovah, even our God, to receive the glory and the honor and the power, because you CREATED all things, and because of your will they existed and were created.”

Jesus also believe in creation, hence he said ...

(Matthew 19:4, 5) 4 In reply he said: “Did you not read that he who CREATED them from [the] beginning made them male and female 5 and said, ‘For this reason a man will leave his father and his mother and will stick to his wife, and the two will be one flesh’?

We believe in the bible rather than the theory of evolution.

We believe that God created all things, such as our beautiful planet and the things in it.

Well I don't know since you put theory behind it.

Maybe try their website.... jw.org