combine two venn diagramms in beamer

Question

I am relatively experienced in LaTeX and Beamer but totally new in TikZ environment. I have create two Venn diagrams as follows:

\documentclass{beamer}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[french]{babel}
\usepackage[absolute,overlay]{textpos}
\usepackage{tikz}

\begin{document}
\begin{frame}
\begin{textblock*}{1.5cm}(0.1cm,0.2cm) % {block width} (coords)
\begin{tikzpicture}
  \begin{scope}[blend group = soft light]
    \fill[red!30!white]   ( 90:1.2) circle (2);
    \fill[green!30!white] (210:1.2) circle (2);
    \fill[blue!30!white]  (330:1.2) circle (2);
  \end{scope}
  \node at ( 90:2)    {Élaboration};
  \node at (-1.5,-0.97)   {Fonctionnalisation};
  \node at ( 330:2)   {\underline{Caractérisation}};
  \node [font=\Large] {LMPT};
\end{tikzpicture}
\end{textblock*}

\begin{textblock*}{1.5cm}(6.6cm,0.2cm) % {block width} (coords)
\begin{tikzpicture}
  \begin{scope}[blend group = soft light]
    \fill[red!60!white]   ( 90:1.2) circle (2);
    \fill[green!60!white] (210:1.2) circle (2);
    \fill[blue!60!white]  (330:1.2) circle (2);
  \end{scope}
  \node at ( 90:2)    {Pluridisciplinarité};
  \node at (-1.5,-0.98)   {Expérience};
  \node at ( 330:2)   {Techniques};
  \node [font=\Large] {Moi};
\end{tikzpicture}
\end{textblock*}

\end{frame}
\end{document}

Questions:

1. How can I add a box, below the two venn diagrams, with arrows pointing to it that combine the two venn diagrams and containing a text?
2. How can I add text into two lines?
3. How can I get rid of the textblock environment?
4. Is it possible to add animation? That is first appears the left diagram, then the right and finally the box of question (1).

These are the basic questions but I would appreciate any other susggestions to make this particular frame more fancy.

For completeness, I provide the link where I found the original code for the Venn diagrams: http://www.texample.net/tikz/examples/venn/

Answer 1

There are several ways you could do this I think. Below I moved everything into one tikzpicture. The normal overlay commands of beamer, like \only and \uncover works also in here, so you can use that for point 4. Point 1 is done by adding a new \node at the end of the diagram, and because everything is in one tikzpicture, you don't need textblock. For point 3 I suppose you mean Manual/automatic line breaks and text alignment in TikZ nodes

The third of three slides looks like this:

\documentclass{beamer}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[french]{babel}
\usepackage{tikz}

\begin{document}
\begin{frame}
\begin{tikzpicture}[scale=0.9]
\uncover<1->{
  \begin{scope}[blend group = soft light]
    \fill[red!30!white]   ( 90:1.2) circle (2);
    \fill[green!30!white] (210:1.2) circle (2);
    \fill[blue!30!white]  (330:1.2) circle (2);
  \end{scope}
  \node at ( 90:2)    {Élaboration};
  \node at (-1.5,-0.97)   {Fonctionnalisation};
  \node at ( 330:2)   {\underline{Caractérisation}};
  \node [font=\Large] {LMPT};
}
\uncover<2->{
\begin{scope}[xshift=6.2cm]
  \begin{scope}[blend group = soft light]
    \fill[red!60!white]   ( 90:1.2) circle (2);
    \fill[green!60!white] (210:1.2) circle (2);
    \fill[blue!60!white]  (330:1.2) circle (2);
  \end{scope}
  \node at ( 90:2)    {Pluridisciplinarité};
  \node at (-1.5,-0.98)   {Expérience};
  \node at ( 330:2)   {Techniques};
  \node [font=\Large] {Moi};
\end{scope}
}

\uncover<3>{
\node [below=1cm,draw] (txt) at (current bounding box.south) {What is this?};

\draw [stealth-] (txt) -- ++(135:2cm);
\draw [stealth-] (txt) -- ++(45:2cm);
}


\end{tikzpicture}
\end{frame}
\end{document}