Individuals crossing exclusively within the same population produce more progeny than those crossing in both directions and thereby use up some of their gametes for the production of inviable hybrids.
Almost all cultures found ways to preserve dairy products, but typically these would involve a fermentation that used up the lactose in the milk, like in yogurt or in cafes.
I'm full. I'm stuffed. I can't eat another bite. I ate too much. I need a rest. I need to take it easy. I'll gain weight. I'll get fat. I need to walk it off.
Qin said the pressure comes in the later period when fresh vegetables are consumed and only cabbages, potatoes, and onions are left, but they will by all means make some food materials, such as tofu and bean sprouts.