  For a tropical prevariety in ${R}^n$ given by a system of $k$ tropical
polynomials in $n$ variables with degrees at most $d$, we prove that its number
of connected components is less than ${k+7n-1 \choose 3n} \cdot
\frac{d^{3n}}{k+n+1}$. On a number of $0$-dimensional connected components a
better bound ${k+4n \choose 3n} \cdot \frac{d^n}{k+n+1}$ is obtained, which
extends the Bezout bound due to B.~Sturmfels from the the case $k=n$ to an
arbitrary $k\ge n$. Also we show that the latter bound is close to sharp, in
particular, the number of connected components can depend on $k$.
