How else will we be able to survive on Mars?
Example situation: What do you do with the parts of the tomato plant that people don't want to eat? -- That's why we need goats and chickens.
And their wastes are fertilizer, which we will need after we have processed the necessary amount of Martian soil to make it usable.
More immediate benefits of automation and networking in agriculture include water conservation, reductions in pesticide, herbicide, and fertilizer use, control of plant diseases and pests ... and lower long-term costs.