There are several different models that represent compounds. One type of model is shown. What type of model is shown?

a structural formula
a chemical formula
a space-filling model
a ball-and-stick model

You need to give use the answers

Mars and earth have quite a few things in common. both are  terrestrial planets, both are located within the sun’s  habitable zone, both have  polar ice caps, similarly  tilted axes, and similar  variations in temperature. and according to some of the latest scientific data obtained by rovers and atmospheric probes, it is now known that mars once had a  dense atmosphere  and was covered with  warm, flowing water.

Sorry i dont know the answer but i hope we can be friends