1. The reading passage is primarily about the relationship between chickens and humans, focusing on the number of chickens compared to humans on Earth and explaining what an omnivore is. 2. According to the passage, there are more chickens than humans on Earth. The exact ratio or number is not provided in the question, but it implies chickens outnumber humans. 3. An omnivore is an animal that eats both plants and animals. This means omnivores have a varied diet including meat and vegetation.