Great white sharks. Trophic Pyramid Information that is in video: An ecological pyramid (also trophic pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or biomass productivity at each trophic level in a given ecosystem.
The risk is that you may not be able to remove all the acid and if it is left on the metal it will continue to corrode the metal. So to give you a quick answer, you can use vinegar to etch the aluminum, but you have to rinse the surface thoroughly to remove all the acid residue.
Paint can make a pet-scratched aluminum door look almost new again. Aluminum is a common material for storm and screen doors, which are installed in front of an exterior door. Aluminum is also used for some bi-fold closet and cabinet doors. Although you can paint aluminum with nearly any paint, exterior-grade spray-paint leaves an even, smooth finish without brushstrokes, and it dries faster and bonds better than latex. Unless you have chosen low- or no-fume spray-paint, work outdoors or in a garage with the main door opened.