Zebras were not used for ridibg, at best they pulled coaches.
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Before there were Bantu, there were Khoisan. That vast area was not empty.
Khoisan split off from the rest of the human race more than a quarter of a million years ago. Bantu are genetically closer to Amerindians than to San. San are different.
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The Khoisan were hunter-gatherers, how would they have domesticated any animal when they weren't even domesticating plants to feed them?
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Many (all?) domesticated animals don't require domesticated plants. Horses, cattle, camels, sheep.
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Right, still, the khoisan were hunter gatherers, domesticating large animals wasn't part of their subsistance mode.
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In agrarian societies, the limit to population density is generally the efficiency of agriculture: the better the farming techniques, the larger the population that can be sustained. Domesticated animals would help a lot there. But disease is also a constraint, as are famines.
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No, the main limit is climatic and soil suitability. Disease is a constraint on humans and livestock as well as pests for crops. Winter eliminates most of them in temperate climates, it doesn't in tropical areas.
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"No, the main limit is climatic and soil suitability." Prior to the industrial revolution, the world population was kept below a billion by the low productivity of agriculture. Modern technology has vastly increased agricultural output, enabling 7.5 billion -- and still growing.
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No, improvements in hygiene and medicine led to shrinking child mortality which led to population explosion.
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Hunger has historically been a major factor in child mortality. Still plays a role in some poor countries.
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