1. A system with a mobile robot for use inside an animal body during minimally invasive surgery, comprising: a laparoscopic surgical tool, wherein the robot is adapted to fit through a port of the laparoscopic surgical tool; a body for incorporating components of the robot; a mobilization element coupled to the body for moving the body of the robot within the animal body, the mobilization element comprising two wheels disposed along a longitudinal dimension of the body and having an axis of rotation substantially parallel to the longitudinal dimension; a member disposed between the two wheels and extending from the body in a direction substantially perpendicular to the axis of rotation of the two wheels for converting rotational motion of the wheels into translational motion of the body; a controller for controlling remotely the mobilization element; an actuator coupled to the controller and mobilization element, the actuator configured to provide movement to the mobilization element based on input from the controller; a power supply adapted to power the actuator; and a means for obtaining a biopsy sample.