Omnivores

omnivores: animals that consume both plants and animals.
oocytes: the developed oogonia in a female after the age of puberty.
oogonia: primitive egg cells that accumulate in the ovaries before a female is born.
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Thus, from an energy-and environmental-point of view, it is more efficient for humans to be primary consumers (to subsist from vegetables, grains, legumes, fruit, cotton, etc.) than as secondary consumers (from eating herbivores, omnivores, ...
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Dogs (again not only domestic dogs, though it is debated whether they are carnivores or omnivores, but wild dogs such as coyotes and wolves etc.)
Hyenas and other scavengers
Weasels
Some skunks
Polar Bears ...
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Consumer level in most food chains (herbivores,carnivores,omnivores).
Food source, beasts of burden and transportation, recreation, and companionship.
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