# Itemize without any type of bullets. Why? [duplicate]

I am trying to elaborate a list with bullets.

But, when I do it, the PDF file is with no bullets at all!

Why?

\RequirePackage{flashmovie}
\documentclass[12pt]{beamer}
\setbeamertemplate{footline}
{
\leavevmode%
\hbox{%
}
\vskip0pt%
}
\usepackage[backend=biber]{biblatex}
\usepackage{tikz}
\usepackage{ragged2e}
\usepackage{animate}
\usepackage{gensymb}
\usepackage{tabularx}
\usepackage{amsmath,amsfonts, amssymb}
\usepackage{cancel}
\usepackage{mathtools}
\usepackage[version=4]{mhchem}
\usepackage{rotating}
\usepackage[all]{xy}
\usepackage{pdflscape}
\usepackage{multirow}
\usepackage{gensymb}
\usepackage{chemfig}
\usepackage{multicol}
\usepackage[spanish]{babel}
\usepackage{expl3}
\usepackage{l3regex}
\usepackage{enumitem}
\usepackage{stackengine}
\usecolortheme{seahorse}
\usetheme{Goettingen}

\begin{document}
\justify
\begin{frame}
\titlepage
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   %%%%%%%%%%%%%%%%%
\section{Balance}
\subsection{reacciones}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}{reacciones}
%\begin{frame}{}[plain]
\justify
Las reacciones
\begin{itemize}
\item ds
\end{itemize}

\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}