Most plant remedies are drawn in very high potencies. The guides often recommend them in 10m & higher. One reason might be that they're more closely allied to the plant protits in the mitochondria and can work on ATP at the deepest level.
Animal remedies are drawn 6x - 30x usually unless they're used for euthanasia. For euthanasia the guides usually pick very high Kali cyan and hydrocyan so the snake poisons and spider venoms. For Kenchu it was Bufo 30 (and Lith Carb 6), both in life and death, so it can vary for cytotoxic purposes.
The elements vary greatly in potency depending on their positron in the periodic table..
The two extremes of the periodic table are usually given low to correct the excesses of acidity and alkalinity.
The transitional elements, being potential ORMEs, are given higher.