Context: Only a few contemporary societies are classified as hunter-gatherers, and many supplement their foraging activity with horticulture and/or keeping animals.

Question: How many groups of modern hunter-gatherers are there?
Answer: Only a few

Question: What do modern hunter-gatherers use to produce food in addition to gathering?
Answer: horticulture and/or keeping animals

Question: Who uses agriculture and animal domestication to supplement their food?
Answer: hunter-gatherers

Question: Besides  agriculture, how do gatherers add to their food supply?
Answer: keeping animals

Question: In addition to domesticated animals, how do gatherers supplement their food?
Answer: horticulture

Question: All of contemporary societies are classified as what?
Answer: Unanswerable

Question: Which societies replace foraging with horticulture and/or keeping animals?
Answer: Unanswerable

Question: Only a few ancient societies are classified as what?
Answer: Unanswerable

Question: All societies supplement their foraging activity with what?
Answer: Unanswerable

Question: How many ancient societies kept animals?
Answer: Unanswerable