Start with your producers, or plants (grasses, flowers, etc.). Then your 1st level consumers (herbivores), like grasshoppers, mice, etc. Then your second level producers (carnivores and omnivores) that eat the herbivores (like birds). And keep going, knowing each of the levels get eaten by each other. 10% of energy is transferred in each level. An example might be...
Grass > Mice > Hawk > Vulture
Probably like 20 pounds just to start
Margarine lasts for 4-5 Months (in the fridge) and 6-8 Months (in the freezer)
the only one I know is early breast cancer
Individually packaged condiments