Studies have found that if the meal is opened a few minutes later, human babies will cry loudly, but for penguins 3 to 4 months old, they are extremely calm. When the parents of the little penguin went out for food, They even have to adapt to the dilemma of no food for a few days. Which of the following, if true, could explain this phenomenon? :. [', 4-month-old penguins are not well developed, so their food intake is relatively small.', 'When female penguins go for food, male penguins feed their cubs with secretions from their stomachs.', 'When the big penguins go out, the little penguins often get together to warm up at night.', 'When the Volkswagen Goose is absent, the call of the little penguin will attract natural enemies.']